Technical Rocket Oldsmobile V8 Information Compiled

F&J · Aug 18, 2016

curbspeed said: ↑

Anyone have a good suggestion for a high torque mini starter that I can use on my 176 tooth 371? I went to put my NOS(What I thought anyways) starter on my starter crossover and it is the wrong bolt pattern. It must be for a 303-324. I never noticed it until now. I've had it for years and never noticed. I hate to use something that modern but at this point I just need it to work. Brand and price would be great to know. Thanks
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I might be able to look up the number on your starter to see if you have the right one.
I know I have older numbers in my books, but I will look.

.

curbspeed · Aug 18, 2016

I post up what I have tomorrow when I get a chance to look at it. Thanks

vtwhead · Aug 19, 2016

Curbspeed, Tony has the gear reduction starters in stock FWIW.

curbspeed · Aug 19, 2016

I saw that on his website. I'm afraid to ask how much. He has no prices listed. Maybe if he sees this he can chime in. There is one listed on Ebay for $205 right now. Not sure of the quality.

Freaky1 · Aug 19, 2016

carbking said: ↑

Again, the above is a GUESS, based on working on hundreds of tripowers in the last 50 years. Not saying you cannot make it work, but don't think it will be easy.
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While I suppose anything is actually possible, I've learned that when someone a background like yours says "but I don't think it will be easy" I can guarantee it will not be easy and more likely next to impossible. Thanks for the advice Jon and I had already been to your site, poked around a bit, and was very impressed. I really didn't think linking all three together would be possible but sometimes you've just got to ask.

I've got to get the chassis finished before winter and get the heads and manifold off to the head shop soon. Once they are all back and the snow is flying I'll start a thread on getting the 303 ready and the J-2 working and finished up. Thanks to everyone for the advice, I appreciate it.

J. A. Miller · Aug 19, 2016

Here's some good info on sealing the end carbs on J2 setups.
http://www.jalopyjournal.com/forum/...hrottle-bodies-with-common-materials.1029907/

az2bc · Aug 30, 2016

Does anyone know about the Studebaker adjustable rocker arm swap?

Zaloryan said: ↑

If you choose to run a solid roller camshaft, you will need adjustable rocker arms. These are made from a rare metal called UnObtainium ($). Expect to pay a hefty price for them, or make your own for a lot less. Find a set of Studebaker V8 rocker arms. You don't need the shafts of rocker stands. Use 1962 Cadillac shafts. They're a lot less likely to break than those expensive McGurk rockers you were drooling over on eBay.
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I have a 58 371... If you could spell it out for idiots like me, that would be great.

Also of note,
Pertronix Ignitor III 71181 with their coil, wires and a msd cap look stock but run like those points never did. Ever.

Also,
58 olds 9.3 rear brake cylinders not stocked at local parts places and $$$ at fusick. A couple years later Olds rear cylinders Dorman W13387 & W13388 (autozone 33004 & 33005) are a little bigger, but fit and are $7 at summit or $12 at the zone.

I couldn't figure out what to swap in the front, so had to pay fusick $55 each or some such nonsense.

Freaky1 · Oct 21, 2016

Goodies have arrived and I think the J-2 will be shelved for now.

I've got all the goodies for the heads in a box. I think I've got enough options for now, time to get started on making the Henry J ready for this Rocket Power Plant.

clunker · Oct 21, 2016

I'm a fan of the 4jets, are you going to run them?

Freaky1 · Oct 21, 2016

Probably, I've got a couple other options but since they came with the intake & they seem to be in decent shape they are going to get the attention. My goal is to have the J done to run at the Hot Rod Dirt Drags next June. That's not very far off so the path of least resistance is the one I'm choosing.

falcongeorge · Oct 21, 2016

clunker said: ↑

I'm a fan of the 4jets, are you going to run them?
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Im curious about the early 4jets as well, you see them a lot back then, but now everyone seems to run dual WCFB's

Ziptiesandducktape · Nov 14, 2016

Zaloryan said: ↑

Contents:
1. Credits, Introduction
2. Blocks & Pistons
3. Crankshaft & Connecting Rods
4. Cylinder Heads
5. Intake Manifolds, Exhaust Headers
6. Camshaft & Valvetrain
7. Ignition & Oiling
8. Engine Build Recipes
9. Vintage Speed Part Suppliers
10. Transmissions, Starters, Flywheels, & Adapters
11. Magazine Technical Articles
12. Current Known Parts Suppliers (2012)
13. Oldsmobile Differentials
14. Oil Choice

(1) Credits, Introduction

"Everytime you think you've got it figured out, you figure out you were wrong." -Bill Brosh

Much of this information is a compilation of what I've found on the internet. Most of the contributors are DON_WOW, BlownOlds, Yorgatron, Blackrat40, C9, F&J, Blackrat40, Tony Lambardi of Ross Racing Engines, and Dennis Choinski. I'm sorry if I didn't include you, I forgot to. Just wanted to give credit where credit is due. I sure wish I could have talked with some of these old timers. Oldsmobile isn't around anymore and these old fellows won't be here forever. As the younger generation it is your responsibility to get this information so it may be passed on. -Mitch

Early Oldsmobile V8s. The "Original" Rocket.

(2) Blocks & Pistons:

CID Bore Stroke
303: 3.750 3.4375
324: 3.875 3.4375
371: 4.000 3.6875
394: 4.125 3.6875

Cast Timeline:
1949-1953: Same castings.
1954: 324 Introduced.
1955: Larger bore.
1956: Larger camshaft.
1957-1958: Larger bore (again), mains, lifters. Deck height got taller by 1/8 inch.
1959-1960: Larger bore (394), mains (again), oil pump drive changed to hex shaft. Deck got taller by 1/4 inch, cam got longer.
1961-62: Oil pump changed.
1963-64: Front cover changed.

Stock cast pistons will crack from wrist pin to the skirt under boost application over 8 pounds or so.

Got a rear main leak? Real common leak if you lost or forgot to install the two small cork pieces on each side of rear main cap. Check that out before you mess with rope seal. A rope seal properly installed works fine with no leaks, but if you have to have a split seal use a VICTOR JV604. But if you don't piss rocket fuel i'd still check out the cork on each side of rear main. The older the rope seal, the better. Try to get one that's NOS, yes it may have asbestos in it.

You can adapt an old Oldsmobile Toronado front engine bracket to fit you 303. It even bolts up in the same place as the 303 bracket. Drill two holes & bolt it up.

371 Pistons vs 394 Pistons: 394 piston is 0.128 shorter pin height than 371. NO compression with no change in deck or rod. Gotta do more to get even with what you started with. 371 pistons best choice for 4 inch bore.

**Stray away from Total Seal Rings, there have been a few threads on the H.A.M.B. of engines burning up oil, smoking, and not seating the rings**

Supposedly it was popular back in the day to bore out a 324 to a 4 inch bore & use a standard bore 371 piston. This would make a 345 Oldsmobile. 371 pistons would work, same compression height. 371 blocks had a higher deck because of the longer stroke. (Sonic check block to ensure it has enough material to handle that much boring. Probably not too good of an idea considering how long project engine has sat. Do a sonic check.)

Punch out a 324 to a 4 inch bore and you can use 371 standard size pistons. 371 pistons are just a tinge taller, bumping up compression slightly.
Top of 324 piston to center of pin =1.875-1.878
Top of 371 piston to center of pin =1.895-1.898
Deck is .25 higher on 371, Rod length is the same at 6.625
371 rods are around .94 in width --324 are close to 1.0

Blackrat40:
According to Joe Mondello, famous Oldsmobile performance enthusiast, you can bore out a 303 or 324 to 4 inch bore (0.125 cut). Block should have enough material left for another 0.030 cut! (If you don't know history of the engine, it would be wise to sonic check block so you know how much material you have.) I talked about my concern for thin cyl walls and running hot in the Texas summers. Joe says there is still plenty of meat left with a 4" 324. It makes a little more than 346 c.i. I think. WATCH OUT SBC 350 Belly Button Bowtie Boys!

Here's a tidbit that '49-56 Olds engine builders may need to know: Before you send your bare block to the machine shop for cleaning,be sure to take the 2 front oil gallery plugs out and keep them for the rebuilding. The one that goes on the passenger side has a small hole (~ 1/16") drilled in it to shoot oil on the timing chain. The youngsters in the shops
nowdays will send it back to you with Chevy style solid plugs in it and the chain won't get as much oil as it needs. Try to find an original if the loose them for you!

**Engine Break-in Procedure**
After cam break in, go out and hammer that motor from 30-40 mph to 80 mph and coast down. Repeat a dozen times and then change oil to what you run. Then drive like you had it for years.

(3) Crankshafts & Connecting Rods:

All crankshafts are forged steel for all Rocket engines...(303-394)
1949-1956: Almost same. (Different bolt size for flywheel & balancer.)
1957-1958: 1/4 inch stroke, Larger mains, rods narrower on crank, externally balanced.
1959-1964: Larger Mains and Longer Rods.

1949-1958: 6.625 inches center to center. (Look like 1965+ Oldsmobile Rods, Bearings too. Some Cadillac bearings may work)
1959-1964: 7.000 inches center to center. (394 ONLY)

Mopar BB (354-392-440) ARP rod bolts will work for 303, 324, & 371. (Read somewhere not compatible with 394 rods) Run at least 0.012 side clearance on connecting rods.

*1957 Crankshaft with main journals turned down will fit a 1949-1956 engine for 1/4 inch stroke increase.
1959-1964 crank: Turn down mains & offset grind rod journals for extra stroke in a 1957 block.

1957-58 371 & 1959-1960 371 Similarities: Same crank forging number (Different journal sizes), same bore and stroke, same oil pump(?), and same timing chain set. Just about everything else is different. Consider a 1959-60 371 as a small bore 394.

Later model Pontiac 400 rods should work after they get machined to be narrow enough for a 324 crankshaft. Pontiac Rods & Bearings can fit 1949-1956. Should be the same part number. Pontiac rod has the same 6.625 inch center to center distance as the Oldsmobile rod.
Buick 455 Rod Bearings fit 1957-1958. (Grind Oil Squirt Hole)
Oldsmobile Rod Bearings for 400, 425, & 455 work for 1959-1964 Rods.

(4) Cylinder Head Identification:

(1949-1950 Heads may not have marking on top)
#2 Early 303 (Usually 1952)
#3 1953
#7 1954
#8 1955
#10 1956
#14 1957-1958 371
#16 1957-1958 371
#17 Heavy Truck Head (GMC)
#18 1959-1960
#20 Non-Starfire
#21 (Exist? Rumored, cannot confirm. Possible Industrial Application)
#23 1961-1964 Starfire (Different exhaust bolt pattern than #18 heads) Pretty strong heads.

1956 324 V8s have better flowing heads and bigger camshaft journals than the previous 303/324. Always use a head gasket which matches your cylinder head. Only exception: Bore out a 303 to 4 inch bore, use 324 head gaskets. Cometic MLS head gaskets are the best.

Valve Diameters:
1949-1955: 1.75 (Intake) 1.4375 (Exhaust)
1956: 1.75 (Intake) 1.5625 (Exhaust)

Owen Thomas, Thoughts on filling center exhaust port with divider:
My concern with the aluminum filling the crossover is more about the heat it might trap. A big heat sink. One problem we did have with Olds engines was breaking exhaust valves. This is caused by the concentration of heat where the two center exhaust valves are close to each other. I understand what you are trying to do with the ports, but I kind of doubt that filling that area does much. One place to find out is on a flow bench. Flow a stock head then a filled head. Know anyone with a flow bench? Be fun to try. One thing some of the guys used to do was to weld in a port divider in the center exhaust ports, then have individual header pipes. That always sounded good, but I never saw any flow results on it A long time ago…at Olds we got in an engine from an Indiana State Highway Patrol car that had blown. Olds made special engines for their Police cars. They were painted silver if you ever run across one. Anyway, the worksheet on this engine said that the Police car had been in a long sustained pursuit at top speed when the engine let go. We found a dropped an exhaust valve. Not good for Olds, but good for the pursuee (is that a word?). Can you imagine seeing a rapidly diminishing red gumball in your rear view mirror?

(5) Intake Manifolds & Exhaust Headers:

*Measure your intake ports if in doubt!*

1949-1955: 303 intakes all interchange with each other. 1954-1955 324 intakes stick with 1954-1955 324s, will not work on 1956 324 with 1956 heads.
1956: 324s got taller intake ports, larger valves, but kept same deck height. (1956 324 intake will not work on heads 1949-1955)
1957: 371 had a taller deck height with same size intake ports.
1959+: Taller deck than 1957-58 with same ports as 1956 324.

All 1949-55 Intakes are created equal. 56 324s sound like a lone wolf, but are somewhat common. Later engines are alone too - Although port sizes are the same, the deck height will cause intake width problems that will need custom spacers or machine work to swap. This does not include "Log Style" (2 piece) manifolds which should fit 1949-55 engines or 1956-64 engines depending on port size.

303 intakes won't work on later style heads on a 371 or 394. Probably not going to work on #10 heads. 324 & 371 intakes can go down on early style heads (49-55). Just port out early head runners to match larger intake ports. Angle bank is the same on all engines, 303-394. Don't forget to enlargen bolt holes on 371 intake if fitting to 303 or 324.

Intake Port Measurements. *Castings may vary slightly and gaskets will be a tinge larger as may aftermarket intakes*
303: 1-1/8 x 1-5/8
324: 1-1/8 x 2
Early 371: 1-1/4 x 2
Late 371 & 394: 1-3/8 x 2-1/2

As previously mentioned, intake ports on 54-56 heads are taller than 49-53 heads. Some intakes (Edelbrock OL396 3x2) are cast with the shorter ports but have enough material on them to be ported out to fit the taller ports.

If you're good at welding, you may be able to adapt a Mopar 383 or 440 intake manifold.

Headers: No company makes headers for this application as of 2012 (to my knowledge). A little searching will get you some header flanges, however. Build your own.

*Want to run a J2 option but don't have a 371? No problem!
Yes, you can run the 371 intake on a 303 or 324. Enlarge the bolt holes in the 371 intake, use a 371 intake gasket to pattern how much to port your heads so the smaller intake ports will not restrict the flow so bad. Just blend the openings down into the head ports around 1/2 inch to smooth out the flow from the intake to the cylinder head passages. The angle is the same, use 371 gaskets and bolt it on.

(6) Camshaft & Valvetrain:

Rocker Ratio:
1949-1951: 1.5:1
1952-1964: 1.8:1 (1959-1964 Rocker Arms are Offset)
Cheap neat trick is to use 1.8/1 on early 1949-51 engines, add a four barrel intake, headers; will net you 60 dyno proven horses

•Must use adjustable rockers or pushrods with solid cam or roller cam
•Chevy lifters can be used but need shorter pushrods
•Aluminum retainers were available from Isky (maybe others?) – possibly for use with standard locks, but have the problem of pulling through…
•Cheap HP formula: swap early 1.5s to 1.8s, + 4 bbl + headers = 60 hp
•Studebaker rocker arms from 1951-1957 232-259 v8 can be adapted. They have a 1.8:1 ratio
•Rocker Arm Specialists in Redding, CA will make aluminum roller rocker setups for early olds engines.
Prices vary depending on year.
•DRE, who makes Comp Cams shaft rocker setups, will custom make them for early Olds for big bucks.
•Crane is rumored to be producing early Olds rocker setups soon.
•Comp Cams new beehive springs and retainers may be usable on early Olds. Olds started using beehive springs in ’58. Interesting how Oldsmobile was always ahead of everyone else.
•Split duration cam 5 degrees more on exhaust, for hot rod setup put lobe center 108-110, lift under .600, advertised duration 290-305.

More than one way to skin a cat. Olds, one of first to use beehive valvesprings were ahead of the game in the early 60's. Comp cams has a new beehive spring that is lighter and will reduce valve bounce plus raise RPM float levels. Perfect way to avoid retainer interference with rocker and get a high tech spring. Olds started using beehives in '58 because they were having break-in problems with the cam in '57.

How to tell the ratio: The 1.5 was used up to 51 or 52, but lots of hotrod motors used both ratios depending on the cam grind. So, look straight down at the long rocker shaft where they go through the rocker stands. If the shaft looks like it must be almost touching the LARGE rocker stand bolt shank, then it is 1.8 stands...and unless the builer screwed up, then it should also be 1.8 rockers. The 1.5 rocker stands have the long rocker shaft just about dead centered between the LARGE stand bolt, and the SMALLER stand bolt. If this sounds confusing; the 1.8 rockers needed to be offset to the max to have the rocker line up, so Olds moved the rocker shaft right up against the Large stand bolts.

One thing a lot of guys skimp on is a GOOD cleaning of the rocker shafts. Lots of sludge hides inside of rocker shafts. A bunch of solvent ,air pressure, thru all oil holes where the rocker arms ride. Clean, clean, clean, then run a Dill's pipe cleaner thru all passages until it stays white, and the same treatment goes for all rocker arms also. Then use a series -3 diesel oil.

Cams: Forget horsepower, the engine that will go through usable RPM range in shortest time is the goal!

There were three different factory camshaft "blanks". Not going to go into specs here, but will just talk about what fits what physically. '49-55 uses a small-journal short cam. The '56-8 cam has the same length as '49-55, but has larger journals. The '59-64 has the same journal size as '56-8, but is 1/4" longer (usually spotted by the gap between the flange and the first journal).

1949-1955: Cam journal Diameter: 1.8724-1.8729
1956 324 & 371: Cam journal Diamter: 1.9977-1.9985
1956-1958: Interchange between each other, 1956 cams have lobes not as wide to accomadate smaller lifters. All replacement cams are wide lobe style.
1949-1955: NO you can't just turn the cam journal down to fit because the lobes would not pass thru....just fubared the cam. Bore the block to the 56 spects and use the cam as is, or get the correct cam for small journal block that you have.

If you're building for the street - a mild cam is the way to go! Having said that, it's always nice to have some overlap so the motor still cams a bit at the light; let's folks know that you've got some "go" to "go with the show."

***ENGLE
•PN2711 – grind 134 flat. 288 dur, .460 lift, 3.42 rear. Pulled hard to 6800 rpm, but doggy down low.
•PN2712-grind 153 flat.296 dur, .500 lift, 3000 lb car, 4.56 gear, stick, drove nice & powerful but not good slower speeds

***ERSON
•302 dur, .585 lift. (DON_WOW: Has a bitching idle, strong everywhere, pulled to 7600. 3.90 rear, 4000 lb car. Good combo, ran good
everywhere. Did I mention a bitching idle??)

***CLAY SMITH
* ? 224 Int. duration @0.50 - Intake Lift: 0.513 Exhaust Lift: 0.540 - Intake: 23-67 Exhaust: 72-28 (DON_WOW: This is a split duration cam and favors breathing on the exhaust side. You will need to get some heavier springs to run this lift, but you ought to upgrade springs anyway. Very pleased with the idle & grunt through the whole RPM range. This was for my 4750 pound 1958 98 with 3.42 gears and got high 13's at the track. Has a machine gun beat sound to the idle.)
*C-7080-12-R 270 Int. duration - 280 Exh. duration - Int. Lift: 0.513 - Exh. Lift: 0.540 (Works on the street in a 4700# car with 3.42 rear, just a little soft on bottom end, but comes in strong at mid range. Less weight would let this one do its thing. Idle is a pleasant lumpty.)
•C-284-8-B. 284 deg duration - Lift: 0.530 - Good cam for 324 bored 346. 4000 lb car, 3.90 gears, 12s. (DON_WOW: Lots of "Lumpy-lump" and pulls like a freight train. Got this in my 4 inch bore 324. 108 centerline instead of a 112 for lighter car. You might want
to walk on the wild side. Don't sweat the stop light manners with the Hydro, it will be fine.)

***ISKY
E2: (J2 Camshaft) 270 deg duration - Made for automatic cars and for “public” (wuss) driveability. (Mean sounding) Two inch cam bearing size would require a big hammer to fit into a 303 with 1.8725 inch hole.
E3: (Track/Drag) 274 deg duration - Lift: 0.430 - Intake 28-66 - Exhaust 66-28 (DON_WOW: Good pick, lopey idle.)
J202: Specs??
J303: Specs?? (Lumpy, great top end power)
3/4 Cam?? Classic choice back in the day?

With a manual transmission and a light car you can run a "big" cam with 3.90 or 4.11 gears. 10:1 or more compression recommended. Shoot for a cam with 300 or so duration. A cam of this duration will hate low compression. If you're not a cross-state freeway flyer (Hot Rod Power Tour), choose a 290-305 grind for short runs & bang for your buck. Your Oldsmobile V8 will be happiest with a split duration camshaft, exhaust should be +5 degrees or so on exhaust. Keep lift under 0.600.

If you choose to run a solid roller camshaft, you will need adjustable rocker arms. These are made from a rare metal called UnObtainium ($). Expect to pay a hefty price for them, or make your own for a lot less. Find a set of Studebaker V8 rocker arms. You don't need the shafts of rocker stands. Use 1962 Cadillac shafts. They're a lot less likely to break than those expensive McGurk rockers you were drooling over on eBay.

DON_WOW: I have used cams of 280 - 230, 235 @.050 duration with the Hydro's. Idle set at around 650 to 700, gives that drive-in rock and roll vibe. Like C-9 said, don't worry about the bottom end with the low ratio of the Hydro's first gear. Hell, second gear is lower than some four speed manual box's first. You start getting into the 290 and above range on cams then low speed driving will be a pain with the slobbering. Had a 323 big bad cam in a Hydro once and in town it was a pig. Can't have all your cake and eat it...

Solid Roller Camshaft Notes: Make damn sure to use Series 3 oil CD/SF rating. Will protect pushrod ends from wear.
CI-4 is same specification.

Lifters:
No adjustment on early engines - 49-64- is a bump in the road you have to cross when playing with Rockets. Stock hyd lifters will lay down and sleep somewhere around 4500 rpm. There is more than one way to skin a cat and fix this. The 303-324 blocks will take .842 dia lifter and you can use chevy hyd or solids. Adjustable pushrods or rocker arms will be needed. Rocker arms can be found , but look over carefully for worn out threads and cracks.Aftermarket brands vary in how good and how much abuse they have had in another life. Pushrods can be right to your doorstep brand new in any length from SMITH BROTHERS. Adjustable pushrods with stock rockers in good condition is a good way to go in that you have room to make up for milled heads, different head gaskets and decked blocks or regrind base circle on any cam.
Solid lifters need 1/8 brass rod to plug side hole in chevy lifter. Another way is to shim stock hyd lifter to make it act as a solid. Solid s can run on hyd cam by setting lash .005 cold or .003 hot to make up for ramp on hyd cam. Got to be accurate with this, but there will be no noise or click to give this away. Too tight and you bent a pushrod. IF you have cam heads springs and manifolding to support these old farts will spin 7500 to 8000 rpm---no sweat. But RPM means------------ruins peoples motors------keep it under 7000 and live a looong time.

Now for 371 and 394 blocks we have a problem in that the lifter is .921 dia. Anyone who has played with these ----Blownolds--- can attest to not finding new .921 lifters on your front porch cause somebody had extra. So here is the out on this, REED CAMS, STOCKBRIDGE, GEORGIA will regrind and finish old lifters and you will have a finish better than new ones. I recommend sending even new ones of any type to be worked over by REED. Good insurance when changing cams, or sticking in that new regrind. Rest of rocker arm or pushrod info same as 303-324 ,unless you you get into the grocery money and step up to custom built roller arms based on 440 mopar units, no need for this in steet driven car. Or maybe you like to pull valve cover and say --HEY CHECK THIS OUT--
There is more on this, but later...........

Chevy lifters cannot be used in '57-64 without re-sleeving the lifter bores back down. The '57-64 engines use a 0.921 diameter. But for hydraulics, the '65-7 .921 hydraulic lifters can be used. But don't try to use a '57-64 lifter in a '65-7 engine! Late Olds/Pontiac roller lifters are a drop-in for the '49-56 blocks, if building an early race engine with a solid roller cam. That is from Gene Adams who built Ken Bate's engine. For that matter, there is a hydraulic
roller retrofit lifter for late Olds/Pontiac as well that I imagine would also work.

If you must use lightweight retainers, stick to titanium or tool steel. There's a reason they don't offer aluminum anymore. Stock springs are pretty weak, any mild hop up & you better upgrade so the Rocket can rev.

Front of the block has a bolt on cam thrust plate that earlier motors used. From gasket surface of front cover to cam button contact is 1 7/8 inches. Button is 1 3/4 inches overall, diameter of small end is 3/8 inches. Small diameter where it goes into cam is 7/8 inches long. Free length of spring is 1 inch. Make sure there is not shit in the hole----of the cam that would bind up the depth of the pin entry.

It is possible to use a double roller timing chain from a GMC 370, but probably more economical/easier to use one from a late BB Oldsmobile and have the center reamed/drilled to fit the early motor. Ross Racing Engines can take care of this.

Don't bother with the GMC 370 timing chain. Use a late Oldsmobile 330-455 set, the ream the center hole out to early Oldsmobile size. (0.750??) Drill thre bolt holes in the proper location. If this is too much trouble, for a price you can purchase a ready-done set from Ross Racing Engines in Ohio. They use the best timing set on the current market. Red Label Rollmaster. They will also modify your top gear for around $25 if you send it to them, so you can likely save some money by picking up a Rollmaster set (or other double roller set) for a late Oldsmobile someplace else. Try eBay. Rollmaster also has undersizes in 0.002, 0.004, and possibly 0.006. This is helpful if machinework has been done on the main saddles/caps.

BlownOlds wrote:
I can't see how a solid pushrod would do any damage to a lifter that has a hole in the seat. Never tried though. YEAH, .921's are a problem. There are options however, and DonWow just gave one option. I'll add to that tip that Delta Cams in WA also regrinds lifters. So does Shadbolt in Canada. Delta said $2 per lifter, plus shipping--that's real reasonable. I no longer throw away any .921 diameter lifter, even used hydraulics (including the '65-7 ones). McGurk used to sell slugs that go inside hydraulics to make them a solid (I still have a set). So that is an option, but you'll probably have to make your own. Another option is to have Sherman Racing do their magic on your hydraulics like they do for many of the NHRA stock class racers. This way you don't need an adjustable valve train, but it tends to act like a solid. Also suitable for high RPM. They do something to limit the travel. Conversions cost $225 on your cores. For more commonly used lifters, they will sell outright--- I got a set of .842 late Olds lifters for $250, shipping included. Wound up selling them back off when I sold my 442 project, but they are being used in a street-strip car right now and he is completely happy with them. For more info on the lifters, see:
http://hometown.aol.com/jallensherma...ingProduc.html

For my blown engine, I decided to go with a set of the OH-so-expensive Schubeck ultralight flat solid's instead of trying to use an old roller lifter. These are made of a special ceramic and are very expensive. But after listening to the superstock racers comments as well as two Olds racers who are using the Schubeck flat solids, I sprung the big money for a set. Don't ask how much. A note on the old Thomas magnesium rocker arms: I was told by an old-timer that they break. So I sold mine to a guy. He then broke two, just to prove it true.Used adjustable rockers can be sent to Rocker Arm Specialists in Redding, CA-- they refurbish all types of shaft rocker setups, no matter if the tips are worn or the shaft is grooved etc. They take care of all that. They also have available the more reasonably priced roller rocker setups for early Olds. I think the '49-58 ones are around $350 and the offset '59-64 ones are around $800. Other options for roller rocker setups would be Sharp's, DRE, T&D, and Jesel. They all have one-off custom programs. Be aware this is not cheap. But the profile-milled DRE, T&D, and Jesel arms are WAY nicer than an old blocky converted Mopar arm. Ah, it's nice to have options. Now, I gotta go outside and water my money tree. It still hasn't put on any fruit.

I've had many sets of adjustable Olds rockers and by far most were ball-end screws. That means that an aftermarket cupped pushrod must be utilized, period. About three sets had the cupped screw so that stock-type ball-end pushrods could be used. But most likely whatever you do, you'll probably still have to order custom pushrods anyway since there
are so many variables in a hot-rodded engine that will change the needed length.

*Buick Nailhead Rockers will work for Early Oldsmobile, they just take a larger diameter pushrod*

Oil filter adapter:
http://webpages.charter.net/dhomstad/
Or grab one off a 394 – bolts right on (a 303 at least) – possibly all?
Get three bolt version, shim gasket, clean, paint alum paint both sides, bolt before dry.

Valvesprings for 324: (Possible to use Small Block Ford Springs or Dodge 440 Springs???)
Coils: 7 Active Coils: 5 Length Free: 2.33 Wire Diam: 0.1875 Inside Diam: 1.070 Outside Diam: 1.441
Valve Open - 149-163 - 1.463" Valve Closed - 85-95 - 1.829"

(7) Ignition & Oiling:

When you line up the dots on the timing chain and don't turn the motor , the number six piston is the one on fire. Drop the distributor in with the rotor pointing to number six, you most likley put at number one and were 180 out of time.

Distributors:
1949-1955: No Window for points adjustment. Advance weights are below points. (D style cam gear)
1956-1958: Window for points adjustment. Weights are below rotor. (D style cam gear)
1959-1964: Hex Camshaft Gear.

According to Mallory all distributors will interchange if you match the cam gear to
your engine's year.

If you wanted to put a 1964 distributor in your 1949 motor you would have to swap the
camshaft gear or change the oil pump to a 1959-60 pump which fits the 1949-1960 engines.
If you wanted to put a 1949 distributor in your 1964 motor you would have to swap the
camshaft gear. You cannot use an earlier oil pump in the 1961-64 engines. The newer Oldsmobile engines (330,400,425,455) fit & are the hex drive only. Maybe they have different roll pin or shaft sizes? (0.5 or 0.49)

Crane Cams makes an adjustable vacuum advance unit for the 1956 distributor, there's also a Petronix Ignitor kit for this unit. It will replace the points & allow you to only worry about replacing the cap & rotor.

**Distributors got timing marks on it because it wasn't on the balancer.

Oil Pumps:
1949-1958: Same
1959-1960: Can be used in 1949-1958 if you change the gear on the distributor and the shaft driving the pump.
1961-1964: Get the right pickup for your pan.

There are some parts that either interchange with the late Olds engines, but they are indeed few. As mentioned above, the late Olds timing set can be used if you modify the top gear. The '61-4 394 uses the same pump as the late Olds, so no problem using a high-volume pump on those years. The late Olds distributor gear should also work in the '61-64 engines, though I don't know if the length of the gear has to be either shortened or shimmed up (I haven't gotten that far yet in trying to use a bronze gear). The late gear should then, logically, work in the '49-60 engines if you change from a D-shaped pump shaft to a hex-shaped pump shaft (custom). The '59-60 371 and '59-64 rod bearings are the same as late BBO 400/425/455.

No oil to top end? Key word is fresh, oil feed to rocker shafts starts at number two and four cam bearings. If they are not installed properly with lower hole in bearing lined up with camshaft to crankshaft oil passage and bearing seam at top center of block, oil feed hole is not in line to get oil up to rocker shafts. Easy check is pull rocker shafts off and yank
distributor,then use drill and spin oil pump. No oil coming out of head opening, cam bearing is not right, got a gusher then shafts are dirty.

Oil Filter Adapter: Want to switch from a cartridge filter to a spin on filter? Grab one off any 394 in the boneyard,bolts right on. Three bolt works on 303-324-371-394 just fine and looks same angle and seals on all size blocks. Get the shim gasket as long as your robbing the body, clean good, hit with aluminum paint on both sides and bolt on before paint is dry.

Dennis Choinski speaks on interchanges:
Many people and a magazine writer also have said that the 1959-1964 engines were longer so you could not use those parts say in a 57. I can see how they might think this. 1959-1964 cams are longer about .3 inch longer at the engine flange area. In 1961 main bearing #1 got longer so the crank looks longer. But they were sort of wrong. I have had a 59-64 head on my 54. Head gaskets come two ways, one made just for that engine with just enough holes in just the right spots for that engine, and a gasket that looks like swiss cheese with holes everywhere that can be used on many years. I have a 59 371 engine and that crank looks like a twin to my 57 crank except for bearing sizes. You can turn down the mains and offset grind the rods for more stroke and it does fit in the 57. A 57 could take .125 bore (394 size) and with that 59 crank .250 offset ground stroke its over 400 cubes. The 394 piston could be used. A .250 stroke is .125 up and .125 down so a piston with .125 less compression height would work and the 394 pistons have .125 less than 57 371 piston so everything fits. The 59 oil pump, distributor, front cover, water pump, and heads would fit also. This brings up the next item. A magazine now is running a 394 engine series and says that the front cover and water pump changed in 1959 and was the same till 1964. I don't think so! My GM parts book all my gasket books and my 59 engine front cover says no!!! It changed in 1963 not 1959.

Can anyone prove me wrong? Don't say you know of a car because any engine can be put in any car like the 57 with a 64 at BACK TO THE 50's show I saw. Last minute add on. At a salvage yard with 100 or so 1949-1964 OLDS that I went to the front cover and water pump changed in 63 not 59 or a lot of cars had the wrong engines.

7&7 wrote:
If you look on Mondello's web site you will see a lot of interesting info on Oldsmobile oiling. Granted it mostly pertains to the mid 60's engines never the less if you look at your 303-324-371-394 you will see similarities in how GM machined these blocks. Further more I have a NOS Isky roller in the garage with original paperwork warning against rocker stantion height and rocker ratio. Use black molly on the next cam you install. And also break it in with Rotella T use this instead of oil for the cam break in. What did you use for a oil pump? Rebuild kit? If so, did they square the pump housing? Another way to get proper oil in a Olds is to dress the block completely. Smooth all the interior drain passages port/polish the pump discharge.Oh yea look at the installed height of your valve springs. If your springs are bottoming out then you will kill a cam in minutes.And since you are taking it apart take the spring cups off. This will help cool your springs a little. For $4500 you should have positive valve seals right? If you used 56 heads then your valve geometry may be off. Have them check that when you put it back together. With these early engines you have to make sure you line up all of the oil passages when you start swaping blocks,heads,stantions,rockers.
Also the cam bearings in the early Olds have holes in them for correct oiling as well . Shit I could write for ever on what it could be. Good luck on figuring it out.
Click to expand...

So i can run higher ratio rockers on an 49 to 51 engine with stock pushrods and valve springs ?

Paul · Nov 14, 2016

generally speaking, yes.
although the '49-'50 used 1/4" pushrods,
I would swap in new 5/16" pushrods

Ziptiesandducktape · Nov 14, 2016

Paul said: ↑

generally speaking, yes.
although the '49-'50 used 1/4" pushrods,
I would swap in new 5/16" pushrods
Click to expand...

Dont i also need new rocker shaft supports ?

Paul · Nov 14, 2016

Yes, complete rocker assembly, towers, shafts and rockers.

Jalopy Kid · Nov 14, 2016

I've got a question regarding 394 heads.
I have a 394 in my F100 with #20 heads. When I bought it was advertised as a Skyrocket, but I'm not sure how to confirm this, or what the difference is between a skyrocket and a regular 394.
I have another, non running, 394 with #23 Starfire heads.
Are these heads worth swapping out with my #20 heads?
What all is different between the regular 394, Skyrocket 394, and the Starfire 394?

Sent from my iPhone using The H.A.M.B. mobile app

saltracer219 · Nov 14, 2016

Tony @ Ross Racing may chime in here, but I believe that the difference in those different versions was compression and cam. The starfire had a hotter grind cam for sure.

Paul · Nov 14, 2016

yes, Tony should chime in but,
the #23 heads were the last version of early Olds heads and were what went on the late Starfires and 98s
"Ultra High Compression" engines..
they changed the shape of the combustion chamber to produce a better burn with the higher compression ratios.
higher compression was done using steel shim gaskets
higher horsepower engines also had a performance grind camshaft,
only way to know if you have one would be to pull the timing cover and gear and look at the front of the cam.

Blownolds · Nov 16, 2016

Just some input:
--#18 heads were '59-60 394 and 371 (not to be confused with '57-8 371 which had the same bore/stroke dimensions but were a shorter deck block). These heads had a combustion chamber and exhaust ports that were different from later 394 heads
--#20 heads were '61-non-Starfire. These had the same exhaust ports as the later #23's, but the combustion chamber was unique to the #20's.
--#23 heads were '61 Starfire (hence the old-school nickname "Starfire heads"), and all '62-4 394. These had the same exhaust ports as #20's, but also had their own combustion chamber.

I cannot offer any other info on stock valve sizes, stock springs, or other possible casting differences. But hopefully the above info may be of assistance.

falcongeorge · Nov 16, 2016

Blownolds said: ↑

Just some input:
--#18 heads were '59-60 394 and 371 (not to be confused with '57-8 371 which had the same bore/stroke dimensions but were a shorter deck block). These heads had a combustion chamber and exhaust ports that were different from later 394 heads
--#20 heads were '61-non-Starfire. These had the same exhaust ports as the later #23's, but the combustion chamber was unique to the #20's.
--#23 heads were '61 Starfire (hence the old-school nickname "Starfire heads"), and all '62-4 394. These had the same exhaust ports as #20's, but also had their own combustion chamber.

I cannot offer any other info on stock valve sizes, stock springs, or other possible casting differences. But hopefully the above info may be of assistance.
Click to expand...

great to see you posting again Blownolds!

Freaky1 · Nov 21, 2016

Zaloryan said: ↑

Contents:
1956 324 V8s have better flowing heads and bigger camshaft journals than the previous 303/324. Always use a head gasket which matches your cylinder head. Only exception: Bore out a 303 to 4 inch bore, use 324 head gaskets. Cometic MLS head gaskets are the best.
Click to expand...

So I got me a set of #10 heads and need to get gaskets. Input on better ones, or ones to avoid? I know the quote says Cometic but I'd like some other opinions from those that know.

I hadn't planned on changing the cam in my '49 303 but with adding the new heads I want to make sure I hit all the bases. I had thought about getting new valve guides, rods, and springs but am thinking if I do that I should do new rockers as well. Now my obsessiveness flies into high gear, new rockers should have new rocker shafts right? But then what about the cam towers and new rocker shafts? If I've done all that do I really want my new rods riding on a 67 year old cam with who knows how many miles on it.

All this started with these new heads that are currently disassembled. I don't want to rebuild the entire engine right now, hopefully next winter, but would it be a good idea to do all this head work now? I really just want to get the J on the road this summer for a handful of good times. I already have a list of things on the car itself that are on the "next winter" list. Should this head work be something I could do now and have one less thing on next winter's list?

vtwhead · Nov 21, 2016

I would call Tony at Ross Racing. He has cams and can tell you what gaskets to use. He should know the best as he builds a lot of Olds engines. And yes I would do the heads over with all valves, guides etc. Replace the old lifters with new SBC ones and replace the push rods with new 5/16 pieces. When I did my #10's the machinist used Z28 valves and hardware. Some mods required but it is all new now.

Blownolds · Dec 5, 2016

falcongeorge said: ↑

great to see you posting again Blownolds!
Click to expand...

Thanks, Falcongeorge. Unfortunately, I ended up leaving the hobby indefinitely. Sold or scrapped just about everything by now. But glad to offer input whenever possible!

Blownolds · Dec 5, 2016

Freaky1 said: ↑

So I got me a set of #10 heads and need to get gaskets. Input on better ones, or ones to avoid? I know the quote says Cometic but I'd like some other opinions from those that know.

I hadn't planned on changing the cam in my '49 303 but with adding the new heads I want to make sure I hit all the bases. I had thought about getting new valve guides, rods, and springs but am thinking if I do that I should do new rockers as well. Now my obsessiveness flies into high gear, new rockers should have new rocker shafts right? But then what about the cam towers and new rocker shafts? If I've done all that do I really want my new rods riding on a 67 year old cam with who knows how many miles on it.

All this started with these new heads that are currently disassembled. I don't want to rebuild the entire engine right now, hopefully next winter, but would it be a good idea to do all this head work now? I really just want to get the J on the road this summer for a handful of good times. I already have a list of things on the car itself that are on the "next winter" list. Should this head work be something I could do now and have one less thing on next winter's list?
Click to expand...

Blownolds · Dec 5, 2016

Cometic had a great reputation among race engine builders as of a few years ago. I've been out of the loop for a few years now, so can't say if anything has changed since then.
I'd be surprised if they offer early Olds off-the-shelf as opposed to a custom-ordered run, but anything is possible.

Definitely use the gasket that corresponds to the head, not to the block!

If putting the larger-valve '56 324 #10 heads on a 303 block, then I'd imagine that you'd probably need to enlarge the bore size to the 324 size, as I think someone else mentioned.

FWIW, I think I once saw some '57-8 371 heads (either the rare #14 or the standard #16) on a 324 block once. I cannot remember what the intake manifold was, but probably a 2-piece I'd guess. Or perhaps a 1-piece 371 intake might also fit if machine work was performed?? Dunno. I'm not an expert on the 324's.
Also have no idea if a 1-piece 324 intake could be made to work with '57-8 heads on a 324 block. Perhaps someone else knows.

falcongeorge · Dec 5, 2016

Blownolds said: ↑

Thanks, Falcongeorge. Unfortunately, I ended up leaving the hobby indefinitely. Sold or scrapped just about everything by now. But glad to offer input whenever possible!
Click to expand...

I bought your NOS offset valve guides. on head gaskets, I got a pair of NOS J-2 steel shims for mine, but its a '56 324 with #10's and my intent is to take it out to 4".

John C. Krag · Dec 5, 2016

Zaloryan said: ↑

Contents:
1. Credits, Introduction
2. Blocks & Pistons
3. Crankshaft & Connecting Rods
4. Cylinder Heads
5. Intake Manifolds, Exhaust Headers
6. Camshaft & Valvetrain
7. Ignition & Oiling
8. Engine Build Recipes
9. Vintage Speed Part Suppliers
10. Transmissions, Starters, Flywheels, & Adapters
11. Magazine Technical Articles
12. Current Known Parts Suppliers (2012)
13. Oldsmobile Differentials
14. Oil Choice

(1) Credits, Introduction

"Everytime you think you've got it figured out, you figure out you were wrong." -Bill Brosh

Much of this information is a compilation of what I've found on the internet. Most of the contributors are DON_WOW, BlownOlds, Yorgatron, Blackrat40, C9, F&J, Blackrat40, Tony Lambardi of Ross Racing Engines, and Dennis Choinski. I'm sorry if I didn't include you, I forgot to. Just wanted to give credit where credit is due. I sure wish I could have talked with some of these old timers. Oldsmobile isn't around anymore and these old fellows won't be here forever. As the younger generation it is your responsibility to get this information so it may be passed on. -Mitch

Early Oldsmobile V8s. The "Original" Rocket.

(2) Blocks & Pistons:

CID Bore Stroke
303: 3.750 3.4375
324: 3.875 3.4375
371: 4.000 3.6875
394: 4.125 3.6875

Cast Timeline:
1949-1953: Same castings.
1954: 324 Introduced.
1955: Larger bore.
1956: Larger camshaft.
1957-1958: Larger bore (again), mains, lifters. Deck height got taller by 1/8 inch.
1959-1960: Larger bore (394), mains (again), oil pump drive changed to hex shaft. Deck got taller by 1/4 inch, cam got longer.
1961-62: Oil pump changed.
1963-64: Front cover changed.

Stock cast pistons will crack from wrist pin to the skirt under boost application over 8 pounds or so.

Got a rear main leak? Real common leak if you lost or forgot to install the two small cork pieces on each side of rear main cap. Check that out before you mess with rope seal. A rope seal properly installed works fine with no leaks, but if you have to have a split seal use a VICTOR JV604. But if you don't piss rocket fuel i'd still check out the cork on each side of rear main. The older the rope seal, the better. Try to get one that's NOS, yes it may have asbestos in it.

You can adapt an old Oldsmobile Toronado front engine bracket to fit you 303. It even bolts up in the same place as the 303 bracket. Drill two holes & bolt it up.

371 Pistons vs 394 Pistons: 394 piston is 0.128 shorter pin height than 371. NO compression with no change in deck or rod. Gotta do more to get even with what you started with. 371 pistons best choice for 4 inch bore.

**Stray away from Total Seal Rings, there have been a few threads on the H.A.M.B. of engines burning up oil, smoking, and not seating the rings**

Supposedly it was popular back in the day to bore out a 324 to a 4 inch bore & use a standard bore 371 piston. This would make a 345 Oldsmobile. 371 pistons would work, same compression height. 371 blocks had a higher deck because of the longer stroke. (Sonic check block to ensure it has enough material to handle that much boring. Probably not too good of an idea considering how long project engine has sat. Do a sonic check.)

Punch out a 324 to a 4 inch bore and you can use 371 standard size pistons. 371 pistons are just a tinge taller, bumping up compression slightly.
Top of 324 piston to center of pin =1.875-1.878
Top of 371 piston to center of pin =1.895-1.898
Deck is .25 higher on 371, Rod length is the same at 6.625
371 rods are around .94 in width --324 are close to 1.0

Blackrat40:
According to Joe Mondello, famous Oldsmobile performance enthusiast, you can bore out a 303 or 324 to 4 inch bore (0.125 cut). Block should have enough material left for another 0.030 cut! (If you don't know history of the engine, it would be wise to sonic check block so you know how much material you have.) I talked about my concern for thin cyl walls and running hot in the Texas summers. Joe says there is still plenty of meat left with a 4" 324. It makes a little more than 346 c.i. I think. WATCH OUT SBC 350 Belly Button Bowtie Boys!

Here's a tidbit that '49-56 Olds engine builders may need to know: Before you send your bare block to the machine shop for cleaning,be sure to take the 2 front oil gallery plugs out and keep them for the rebuilding. The one that goes on the passenger side has a small hole (~ 1/16") drilled in it to shoot oil on the timing chain. The youngsters in the shops
nowdays will send it back to you with Chevy style solid plugs in it and the chain won't get as much oil as it needs. Try to find an original if the loose them for you!

**Engine Break-in Procedure**
After cam break in, go out and hammer that motor from 30-40 mph to 80 mph and coast down. Repeat a dozen times and then change oil to what you run. Then drive like you had it for years.

(3) Crankshafts & Connecting Rods:

All crankshafts are forged steel for all Rocket engines...(303-394)
1949-1956: Almost same. (Different bolt size for flywheel & balancer.)
1957-1958: 1/4 inch stroke, Larger mains, rods narrower on crank, externally balanced.
1959-1964: Larger Mains and Longer Rods.

1949-1958: 6.625 inches center to center. (Look like 1965+ Oldsmobile Rods, Bearings too. Some Cadillac bearings may work)
1959-1964: 7.000 inches center to center. (394 ONLY)

Mopar BB (354-392-440) ARP rod bolts will work for 303, 324, & 371. (Read somewhere not compatible with 394 rods) Run at least 0.012 side clearance on connecting rods.

*1957 Crankshaft with main journals turned down will fit a 1949-1956 engine for 1/4 inch stroke increase.
1959-1964 crank: Turn down mains & offset grind rod journals for extra stroke in a 1957 block.

1957-58 371 & 1959-1960 371 Similarities: Same crank forging number (Different journal sizes), same bore and stroke, same oil pump(?), and same timing chain set. Just about everything else is different. Consider a 1959-60 371 as a small bore 394.

Later model Pontiac 400 rods should work after they get machined to be narrow enough for a 324 crankshaft. Pontiac Rods & Bearings can fit 1949-1956. Should be the same part number. Pontiac rod has the same 6.625 inch center to center distance as the Oldsmobile rod.
Buick 455 Rod Bearings fit 1957-1958. (Grind Oil Squirt Hole)
Oldsmobile Rod Bearings for 400, 425, & 455 work for 1959-1964 Rods.

(4) Cylinder Head Identification:

(1949-1950 Heads may not have marking on top)
#2 Early 303 (Usually 1952)
#3 1953
#7 1954
#8 1955
#10 1956
#14 1957-1958 371
#16 1957-1958 371
#17 Heavy Truck Head (GMC)
#18 1959-1960
#20 Non-Starfire
#21 (Exist? Rumored, cannot confirm. Possible Industrial Application)
#23 1961-1964 Starfire (Different exhaust bolt pattern than #18 heads) Pretty strong heads.

1956 324 V8s have better flowing heads and bigger camshaft journals than the previous 303/324. Always use a head gasket which matches your cylinder head. Only exception: Bore out a 303 to 4 inch bore, use 324 head gaskets. Cometic MLS head gaskets are the best.

Valve Diameters:
1949-1955: 1.75 (Intake) 1.4375 (Exhaust)
1956: 1.75 (Intake) 1.5625 (Exhaust)

Owen Thomas, Thoughts on filling center exhaust port with divider:
My concern with the aluminum filling the crossover is more about the heat it might trap. A big heat sink. One problem we did have with Olds engines was breaking exhaust valves. This is caused by the concentration of heat where the two center exhaust valves are close to each other. I understand what you are trying to do with the ports, but I kind of doubt that filling that area does much. One place to find out is on a flow bench. Flow a stock head then a filled head. Know anyone with a flow bench? Be fun to try. One thing some of the guys used to do was to weld in a port divider in the center exhaust ports, then have individual header pipes. That always sounded good, but I never saw any flow results on it A long time ago…at Olds we got in an engine from an Indiana State Highway Patrol car that had blown. Olds made special engines for their Police cars. They were painted silver if you ever run across one. Anyway, the worksheet on this engine said that the Police car had been in a long sustained pursuit at top speed when the engine let go. We found a dropped an exhaust valve. Not good for Olds, but good for the pursuee (is that a word?). Can you imagine seeing a rapidly diminishing red gumball in your rear view mirror?

(5) Intake Manifolds & Exhaust Headers:

*Measure your intake ports if in doubt!*

1949-1955: 303 intakes all interchange with each other. 1954-1955 324 intakes stick with 1954-1955 324s, will not work on 1956 324 with 1956 heads.
1956: 324s got taller intake ports, larger valves, but kept same deck height. (1956 324 intake will not work on heads 1949-1955)
1957: 371 had a taller deck height with same size intake ports.
1959+: Taller deck than 1957-58 with same ports as 1956 324.

All 1949-55 Intakes are created equal. 56 324s sound like a lone wolf, but are somewhat common. Later engines are alone too - Although port sizes are the same, the deck height will cause intake width problems that will need custom spacers or machine work to swap. This does not include "Log Style" (2 piece) manifolds which should fit 1949-55 engines or 1956-64 engines depending on port size.

303 intakes won't work on later style heads on a 371 or 394. Probably not going to work on #10 heads. 324 & 371 intakes can go down on early style heads (49-55). Just port out early head runners to match larger intake ports. Angle bank is the same on all engines, 303-394. Don't forget to enlargen bolt holes on 371 intake if fitting to 303 or 324.

Intake Port Measurements. *Castings may vary slightly and gaskets will be a tinge larger as may aftermarket intakes*
303: 1-1/8 x 1-5/8
324: 1-1/8 x 2
Early 371: 1-1/4 x 2
Late 371 & 394: 1-3/8 x 2-1/2

As previously mentioned, intake ports on 54-56 heads are taller than 49-53 heads. Some intakes (Edelbrock OL396 3x2) are cast with the shorter ports but have enough material on them to be ported out to fit the taller ports.

If you're good at welding, you may be able to adapt a Mopar 383 or 440 intake manifold.

Headers: No company makes headers for this application as of 2012 (to my knowledge). A little searching will get you some header flanges, however. Build your own.

*Want to run a J2 option but don't have a 371? No problem!
Yes, you can run the 371 intake on a 303 or 324. Enlarge the bolt holes in the 371 intake, use a 371 intake gasket to pattern how much to port your heads so the smaller intake ports will not restrict the flow so bad. Just blend the openings down into the head ports around 1/2 inch to smooth out the flow from the intake to the cylinder head passages. The angle is the same, use 371 gaskets and bolt it on.

(6) Camshaft & Valvetrain:

Rocker Ratio:
1949-1951: 1.5:1
1952-1964: 1.8:1 (1959-1964 Rocker Arms are Offset)
Cheap neat trick is to use 1.8/1 on early 1949-51 engines, add a four barrel intake, headers; will net you 60 dyno proven horses

•Must use adjustable rockers or pushrods with solid cam or roller cam
•Chevy lifters can be used but need shorter pushrods
•Aluminum retainers were available from Isky (maybe others?) – possibly for use with standard locks, but have the problem of pulling through…
•Cheap HP formula: swap early 1.5s to 1.8s, + 4 bbl + headers = 60 hp
•Studebaker rocker arms from 1951-1957 232-259 v8 can be adapted. They have a 1.8:1 ratio
•Rocker Arm Specialists in Redding, CA will make aluminum roller rocker setups for early olds engines.
Prices vary depending on year.
•DRE, who makes Comp Cams shaft rocker setups, will custom make them for early Olds for big bucks.
•Crane is rumored to be producing early Olds rocker setups soon.
•Comp Cams new beehive springs and retainers may be usable on early Olds. Olds started using beehive springs in ’58. Interesting how Oldsmobile was always ahead of everyone else.
•Split duration cam 5 degrees more on exhaust, for hot rod setup put lobe center 108-110, lift under .600, advertised duration 290-305.

More than one way to skin a cat. Olds, one of first to use beehive valvesprings were ahead of the game in the early 60's. Comp cams has a new beehive spring that is lighter and will reduce valve bounce plus raise RPM float levels. Perfect way to avoid retainer interference with rocker and get a high tech spring. Olds started using beehives in '58 because they were having break-in problems with the cam in '57.

How to tell the ratio: The 1.5 was used up to 51 or 52, but lots of hotrod motors used both ratios depending on the cam grind. So, look straight down at the long rocker shaft where they go through the rocker stands. If the shaft looks like it must be almost touching the LARGE rocker stand bolt shank, then it is 1.8 stands...and unless the builer screwed up, then it should also be 1.8 rockers. The 1.5 rocker stands have the long rocker shaft just about dead centered between the LARGE stand bolt, and the SMALLER stand bolt. If this sounds confusing; the 1.8 rockers needed to be offset to the max to have the rocker line up, so Olds moved the rocker shaft right up against the Large stand bolts.

One thing a lot of guys skimp on is a GOOD cleaning of the rocker shafts. Lots of sludge hides inside of rocker shafts. A bunch of solvent ,air pressure, thru all oil holes where the rocker arms ride. Clean, clean, clean, then run a Dill's pipe cleaner thru all passages until it stays white, and the same treatment goes for all rocker arms also. Then use a series -3 diesel oil.

Cams: Forget horsepower, the engine that will go through usable RPM range in shortest time is the goal!

There were three different factory camshaft "blanks". Not going to go into specs here, but will just talk about what fits what physically. '49-55 uses a small-journal short cam. The '56-8 cam has the same length as '49-55, but has larger journals. The '59-64 has the same journal size as '56-8, but is 1/4" longer (usually spotted by the gap between the flange and the first journal).

1949-1955: Cam journal Diameter: 1.8724-1.8729
1956 324 & 371: Cam journal Diamter: 1.9977-1.9985
1956-1958: Interchange between each other, 1956 cams have lobes not as wide to accomadate smaller lifters. All replacement cams are wide lobe style.
1949-1955: NO you can't just turn the cam journal down to fit because the lobes would not pass thru....just fubared the cam. Bore the block to the 56 spects and use the cam as is, or get the correct cam for small journal block that you have.

If you're building for the street - a mild cam is the way to go! Having said that, it's always nice to have some overlap so the motor still cams a bit at the light; let's folks know that you've got some "go" to "go with the show."

***ENGLE
•PN2711 – grind 134 flat. 288 dur, .460 lift, 3.42 rear. Pulled hard to 6800 rpm, but doggy down low.
•PN2712-grind 153 flat.296 dur, .500 lift, 3000 lb car, 4.56 gear, stick, drove nice & powerful but not good slower speeds

***ERSON
•302 dur, .585 lift. (DON_WOW: Has a bitching idle, strong everywhere, pulled to 7600. 3.90 rear, 4000 lb car. Good combo, ran good
everywhere. Did I mention a bitching idle??)

***CLAY SMITH
* ? 224 Int. duration @0.50 - Intake Lift: 0.513 Exhaust Lift: 0.540 - Intake: 23-67 Exhaust: 72-28 (DON_WOW: This is a split duration cam and favors breathing on the exhaust side. You will need to get some heavier springs to run this lift, but you ought to upgrade springs anyway. Very pleased with the idle & grunt through the whole RPM range. This was for my 4750 pound 1958 98 with 3.42 gears and got high 13's at the track. Has a machine gun beat sound to the idle.)
*C-7080-12-R 270 Int. duration - 280 Exh. duration - Int. Lift: 0.513 - Exh. Lift: 0.540 (Works on the street in a 4700# car with 3.42 rear, just a little soft on bottom end, but comes in strong at mid range. Less weight would let this one do its thing. Idle is a pleasant lumpty.)
•C-284-8-B. 284 deg duration - Lift: 0.530 - Good cam for 324 bored 346. 4000 lb car, 3.90 gears, 12s. (DON_WOW: Lots of "Lumpy-lump" and pulls like a freight train. Got this in my 4 inch bore 324. 108 centerline instead of a 112 for lighter car. You might want
to walk on the wild side. Don't sweat the stop light manners with the Hydro, it will be fine.)

***ISKY
E2: (J2 Camshaft) 270 deg duration - Made for automatic cars and for “public” (wuss) driveability. (Mean sounding) Two inch cam bearing size would require a big hammer to fit into a 303 with 1.8725 inch hole.
E3: (Track/Drag) 274 deg duration - Lift: 0.430 - Intake 28-66 - Exhaust 66-28 (DON_WOW: Good pick, lopey idle.)
J202: Specs??
J303: Specs?? (Lumpy, great top end power)
3/4 Cam?? Classic choice back in the day?

With a manual transmission and a light car you can run a "big" cam with 3.90 or 4.11 gears. 10:1 or more compression recommended. Shoot for a cam with 300 or so duration. A cam of this duration will hate low compression. If you're not a cross-state freeway flyer (Hot Rod Power Tour), choose a 290-305 grind for short runs & bang for your buck. Your Oldsmobile V8 will be happiest with a split duration camshaft, exhaust should be +5 degrees or so on exhaust. Keep lift under 0.600.

If you choose to run a solid roller camshaft, you will need adjustable rocker arms. These are made from a rare metal called UnObtainium ($). Expect to pay a hefty price for them, or make your own for a lot less. Find a set of Studebaker V8 rocker arms. You don't need the shafts of rocker stands. Use 1962 Cadillac shafts. They're a lot less likely to break than those expensive McGurk rockers you were drooling over on eBay.

DON_WOW: I have used cams of 280 - 230, 235 @.050 duration with the Hydro's. Idle set at around 650 to 700, gives that drive-in rock and roll vibe. Like C-9 said, don't worry about the bottom end with the low ratio of the Hydro's first gear. Hell, second gear is lower than some four speed manual box's first. You start getting into the 290 and above range on cams then low speed driving will be a pain with the slobbering. Had a 323 big bad cam in a Hydro once and in town it was a pig. Can't have all your cake and eat it...

Solid Roller Camshaft Notes: Make damn sure to use Series 3 oil CD/SF rating. Will protect pushrod ends from wear.
CI-4 is same specification.

Lifters:
No adjustment on early engines - 49-64- is a bump in the road you have to cross when playing with Rockets. Stock hyd lifters will lay down and sleep somewhere around 4500 rpm. There is more than one way to skin a cat and fix this. The 303-324 blocks will take .842 dia lifter and you can use chevy hyd or solids. Adjustable pushrods or rocker arms will be needed. Rocker arms can be found , but look over carefully for worn out threads and cracks.Aftermarket brands vary in how good and how much abuse they have had in another life. Pushrods can be right to your doorstep brand new in any length from SMITH BROTHERS. Adjustable pushrods with stock rockers in good condition is a good way to go in that you have room to make up for milled heads, different head gaskets and decked blocks or regrind base circle on any cam.
Solid lifters need 1/8 brass rod to plug side hole in chevy lifter. Another way is to shim stock hyd lifter to make it act as a solid. Solid s can run on hyd cam by setting lash .005 cold or .003 hot to make up for ramp on hyd cam. Got to be accurate with this, but there will be no noise or click to give this away. Too tight and you bent a pushrod. IF you have cam heads springs and manifolding to support these old farts will spin 7500 to 8000 rpm---no sweat. But RPM means------------ruins peoples motors------keep it under 7000 and live a looong time.

Now for 371 and 394 blocks we have a problem in that the lifter is .921 dia. Anyone who has played with these ----Blownolds--- can attest to not finding new .921 lifters on your front porch cause somebody had extra. So here is the out on this, REED CAMS, STOCKBRIDGE, GEORGIA will regrind and finish old lifters and you will have a finish better than new ones. I recommend sending even new ones of any type to be worked over by REED. Good insurance when changing cams, or sticking in that new regrind. Rest of rocker arm or pushrod info same as 303-324 ,unless you you get into the grocery money and step up to custom built roller arms based on 440 mopar units, no need for this in steet driven car. Or maybe you like to pull valve cover and say --HEY CHECK THIS OUT--
There is more on this, but later...........

Chevy lifters cannot be used in '57-64 without re-sleeving the lifter bores back down. The '57-64 engines use a 0.921 diameter. But for hydraulics, the '65-7 .921 hydraulic lifters can be used. But don't try to use a '57-64 lifter in a '65-7 engine! Late Olds/Pontiac roller lifters are a drop-in for the '49-56 blocks, if building an early race engine with a solid roller cam. That is from Gene Adams who built Ken Bate's engine. For that matter, there is a hydraulic
roller retrofit lifter for late Olds/Pontiac as well that I imagine would also work.

If you must use lightweight retainers, stick to titanium or tool steel. There's a reason they don't offer aluminum anymore. Stock springs are pretty weak, any mild hop up & you better upgrade so the Rocket can rev.

Front of the block has a bolt on cam thrust plate that earlier motors used. From gasket surface of front cover to cam button contact is 1 7/8 inches. Button is 1 3/4 inches overall, diameter of small end is 3/8 inches. Small diameter where it goes into cam is 7/8 inches long. Free length of spring is 1 inch. Make sure there is not shit in the hole----of the cam that would bind up the depth of the pin entry.

It is possible to use a double roller timing chain from a GMC 370, but probably more economical/easier to use one from a late BB Oldsmobile and have the center reamed/drilled to fit the early motor. Ross Racing Engines can take care of this.

Don't bother with the GMC 370 timing chain. Use a late Oldsmobile 330-455 set, the ream the center hole out to early Oldsmobile size. (0.750??) Drill thre bolt holes in the proper location. If this is too much trouble, for a price you can purchase a ready-done set from Ross Racing Engines in Ohio. They use the best timing set on the current market. Red Label Rollmaster. They will also modify your top gear for around $25 if you send it to them, so you can likely save some money by picking up a Rollmaster set (or other double roller set) for a late Oldsmobile someplace else. Try eBay. Rollmaster also has undersizes in 0.002, 0.004, and possibly 0.006. This is helpful if machinework has been done on the main saddles/caps.

BlownOlds wrote:
I can't see how a solid pushrod would do any damage to a lifter that has a hole in the seat. Never tried though. YEAH, .921's are a problem. There are options however, and DonWow just gave one option. I'll add to that tip that Delta Cams in WA also regrinds lifters. So does Shadbolt in Canada. Delta said $2 per lifter, plus shipping--that's real reasonable. I no longer throw away any .921 diameter lifter, even used hydraulics (including the '65-7 ones). McGurk used to sell slugs that go inside hydraulics to make them a solid (I still have a set). So that is an option, but you'll probably have to make your own. Another option is to have Sherman Racing do their magic on your hydraulics like they do for many of the NHRA stock class racers. This way you don't need an adjustable valve train, but it tends to act like a solid. Also suitable for high RPM. They do something to limit the travel. Conversions cost $225 on your cores. For more commonly used lifters, they will sell outright--- I got a set of .842 late Olds lifters for $250, shipping included. Wound up selling them back off when I sold my 442 project, but they are being used in a street-strip car right now and he is completely happy with them. For more info on the lifters, see:
http://hometown.aol.com/jallensherma...ingProduc.html

For my blown engine, I decided to go with a set of the OH-so-expensive Schubeck ultralight flat solid's instead of trying to use an old roller lifter. These are made of a special ceramic and are very expensive. But after listening to the superstock racers comments as well as two Olds racers who are using the Schubeck flat solids, I sprung the big money for a set. Don't ask how much. A note on the old Thomas magnesium rocker arms: I was told by an old-timer that they break. So I sold mine to a guy. He then broke two, just to prove it true.Used adjustable rockers can be sent to Rocker Arm Specialists in Redding, CA-- they refurbish all types of shaft rocker setups, no matter if the tips are worn or the shaft is grooved etc. They take care of all that. They also have available the more reasonably priced roller rocker setups for early Olds. I think the '49-58 ones are around $350 and the offset '59-64 ones are around $800. Other options for roller rocker setups would be Sharp's, DRE, T&D, and Jesel. They all have one-off custom programs. Be aware this is not cheap. But the profile-milled DRE, T&D, and Jesel arms are WAY nicer than an old blocky converted Mopar arm. Ah, it's nice to have options. Now, I gotta go outside and water my money tree. It still hasn't put on any fruit.

I've had many sets of adjustable Olds rockers and by far most were ball-end screws. That means that an aftermarket cupped pushrod must be utilized, period. About three sets had the cupped screw so that stock-type ball-end pushrods could be used. But most likely whatever you do, you'll probably still have to order custom pushrods anyway since there
are so many variables in a hot-rodded engine that will change the needed length.

*Buick Nailhead Rockers will work for Early Oldsmobile, they just take a larger diameter pushrod*

Oil filter adapter:
http://webpages.charter.net/dhomstad/
Or grab one off a 394 – bolts right on (a 303 at least) – possibly all?
Get three bolt version, shim gasket, clean, paint alum paint both sides, bolt before dry.

Valvesprings for 324: (Possible to use Small Block Ford Springs or Dodge 440 Springs???)
Coils: 7 Active Coils: 5 Length Free: 2.33 Wire Diam: 0.1875 Inside Diam: 1.070 Outside Diam: 1.441
Valve Open - 149-163 - 1.463" Valve Closed - 85-95 - 1.829"

(7) Ignition & Oiling:

When you line up the dots on the timing chain and don't turn the motor , the number six piston is the one on fire. Drop the distributor in with the rotor pointing to number six, you most likley put at number one and were 180 out of time.

Distributors:
1949-1955: No Window for points adjustment. Advance weights are below points. (D style cam gear)
1956-1958: Window for points adjustment. Weights are below rotor. (D style cam gear)
1959-1964: Hex Camshaft Gear.

According to Mallory all distributors will interchange if you match the cam gear to
your engine's year.

If you wanted to put a 1964 distributor in your 1949 motor you would have to swap the
camshaft gear or change the oil pump to a 1959-60 pump which fits the 1949-1960 engines.
If you wanted to put a 1949 distributor in your 1964 motor you would have to swap the
camshaft gear. You cannot use an earlier oil pump in the 1961-64 engines. The newer Oldsmobile engines (330,400,425,455) fit & are the hex drive only. Maybe they have different roll pin or shaft sizes? (0.5 or 0.49)

Crane Cams makes an adjustable vacuum advance unit for the 1956 distributor, there's also a Petronix Ignitor kit for this unit. It will replace the points & allow you to only worry about replacing the cap & rotor.

**Distributors got timing marks on it because it wasn't on the balancer.

Oil Pumps:
1949-1958: Same
1959-1960: Can be used in 1949-1958 if you change the gear on the distributor and the shaft driving the pump.
1961-1964: Get the right pickup for your pan.

There are some parts that either interchange with the late Olds engines, but they are indeed few. As mentioned above, the late Olds timing set can be used if you modify the top gear. The '61-4 394 uses the same pump as the late Olds, so no problem using a high-volume pump on those years. The late Olds distributor gear should also work in the '61-64 engines, though I don't know if the length of the gear has to be either shortened or shimmed up (I haven't gotten that far yet in trying to use a bronze gear). The late gear should then, logically, work in the '49-60 engines if you change from a D-shaped pump shaft to a hex-shaped pump shaft (custom). The '59-60 371 and '59-64 rod bearings are the same as late BBO 400/425/455.

No oil to top end? Key word is fresh, oil feed to rocker shafts starts at number two and four cam bearings. If they are not installed properly with lower hole in bearing lined up with camshaft to crankshaft oil passage and bearing seam at top center of block, oil feed hole is not in line to get oil up to rocker shafts. Easy check is pull rocker shafts off and yank
distributor,then use drill and spin oil pump. No oil coming out of head opening, cam bearing is not right, got a gusher then shafts are dirty.

Oil Filter Adapter: Want to switch from a cartridge filter to a spin on filter? Grab one off any 394 in the boneyard,bolts right on. Three bolt works on 303-324-371-394 just fine and looks same angle and seals on all size blocks. Get the shim gasket as long as your robbing the body, clean good, hit with aluminum paint on both sides and bolt on before paint is dry.

Dennis Choinski speaks on interchanges:
Many people and a magazine writer also have said that the 1959-1964 engines were longer so you could not use those parts say in a 57. I can see how they might think this. 1959-1964 cams are longer about .3 inch longer at the engine flange area. In 1961 main bearing #1 got longer so the crank looks longer. But they were sort of wrong. I have had a 59-64 head on my 54. Head gaskets come two ways, one made just for that engine with just enough holes in just the right spots for that engine, and a gasket that looks like swiss cheese with holes everywhere that can be used on many years. I have a 59 371 engine and that crank looks like a twin to my 57 crank except for bearing sizes. You can turn down the mains and offset grind the rods for more stroke and it does fit in the 57. A 57 could take .125 bore (394 size) and with that 59 crank .250 offset ground stroke its over 400 cubes. The 394 piston could be used. A .250 stroke is .125 up and .125 down so a piston with .125 less compression height would work and the 394 pistons have .125 less than 57 371 piston so everything fits. The 59 oil pump, distributor, front cover, water pump, and heads would fit also. This brings up the next item. A magazine now is running a 394 engine series and says that the front cover and water pump changed in 1959 and was the same till 1964. I don't think so! My GM parts book all my gasket books and my 59 engine front cover says no!!! It changed in 1963 not 1959.

Can anyone prove me wrong? Don't say you know of a car because any engine can be put in any car like the 57 with a 64 at BACK TO THE 50's show I saw. Last minute add on. At a salvage yard with 100 or so 1949-1964 OLDS that I went to the front cover and water pump changed in 63 not 59 or a lot of cars had the wrong engines.

7&7 wrote:
If you look on Mondello's web site you will see a lot of interesting info on Oldsmobile oiling. Granted it mostly pertains to the mid 60's engines never the less if you look at your 303-324-371-394 you will see similarities in how GM machined these blocks. Further more I have a NOS Isky roller in the garage with original paperwork warning against rocker stantion height and rocker ratio. Use black molly on the next cam you install. And also break it in with Rotella T use this instead of oil for the cam break in. What did you use for a oil pump? Rebuild kit? If so, did they square the pump housing? Another way to get proper oil in a Olds is to dress the block completely. Smooth all the interior drain passages port/polish the pump discharge.Oh yea look at the installed height of your valve springs. If your springs are bottoming out then you will kill a cam in minutes.And since you are taking it apart take the spring cups off. This will help cool your springs a little. For $4500 you should have positive valve seals right? If you used 56 heads then your valve geometry may be off. Have them check that when you put it back together. With these early engines you have to make sure you line up all of the oil passages when you start swaping blocks,heads,stantions,rockers.
Also the cam bearings in the early Olds have holes in them for correct oiling as well . Shit I could write for ever on what it could be. Good luck on figuring it out.
Click to expand...

New Rotella doesn't have enough zinc in it. You have to use a break-in oil from Amsoil,Comp Cams,Brad Penn, Joe Gibbs. Once cam is broken in you need to run a high zinc/phos oil to keep cam/lifters happy.

oldskool2949 · Dec 6, 2016

Blownolds said: ↑

Cometic had a great reputation among race engine builders as of a few years ago. I've been out of the loop for a few years now, so can't say if anything has changed since then.
I'd be surprised if they offer early Olds off-the-shelf as opposed to a custom-ordered run, but anything is possible.

Definitely use the gasket that corresponds to the head, not to the block!

If putting the larger-valve '56 324 #10 heads on a 303 block, then I'd imagine that you'd probably need to enlarge the bore size to the 324 size, as I think someone else mentioned.

FWIW, I think I once saw some '57-8 371 heads (either the rare #14 or the standard #16) on a 324 block once. I cannot remember what the intake manifold was, but probably a 2-piece I'd guess. Or perhaps a 1-piece 371 intake might also fit if machine work was performed?? Dunno. I'm not an expert on the 324's.
Also have no idea if a 1-piece 324 intake could be made to work with '57-8 heads on a 324 block. Perhaps someone else knows.
Click to expand...

I have 371 #16 heads on my 54 324 block. The motor is .060 over, and I run a weiand 03d intake for a 324. The ports were matched to the heads.

Sent from my iPhone using The H.A.M.B. mobile app

jjjmm56 · Dec 7, 2016

I picked up a set of 55, 324 #8, heads for my 49, 303. I'm getting ready to send them out for new valves ,guides, and seats. What size and type of valves should I use. Do I need to stick with olds or go with a Chevy style.

Sent from my iPhone using The H.A.M.B. mobile app

vtwhead · Dec 8, 2016

On my #10's I believe that the shop that did the work used Z28 parts. Dave50 did the work in his shop down in MA.

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