Still in a quandary over this SBC 350??

Well today through me another curve ball.
This 49 chev i bought with a vette engine-
morfed to a 350 truck engine and today I find out the 350 starters won't fit, Auto zone and Napa had starters with offset bolt holes. Mine is straight.
I got a starter for a 305 El Camino/chevell/truck?
Did chevy have a light duty truck they put a 305 in?
Does this starter prove it's a 305?
Did they ever use the starter with the straight bolt pattern in a 350?
I might pull the oil pan to check the crank through, how
much stroke do the 305 and 350 have?
Thanks for any help
Pat

 

Straight bolt pattern is 153 tooth. Across is 168



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The casting numbers on the back passenger side of the block should get you close...there is also casting numbers on the heads if you pull the valve cover off....the crank will also have casting numbers on it....might get lucky and have id numbers stamped on the tab on the front of the block just below the head...yes chevy did use 305s in some of the trucks....

but my 71 had the original 4 bolt main 350 and the starter in it had the straight line starter bolts...it also had a smaller nose cone to fit the bell housing....bitch to find...ended up just swapping the nose cone to the new starter....

 

The 305 and 350 chevy have the same 3.48" stroke.

 

check the back side of the harmonic bal.--if it has a straight back its a 350, if you can curl your fingers into a groove its a 305. This only works if the bal. has'nt been changed

 

Hey "tap", I was checking out your other thread about ID'ing your motor but never chimed in. According to my reference book, your TXD engine code is from a '75 truck as others posted but not just in 3/4 ton and 1 ton. My book shows it in 1/2 tons as well with a 2 bbl carb rated at 145 net HP as opposed to the 160 HP in the other trucks with a 4 bbl.
As far as the 305 goes, it did not appear until '76 and it shares the same 3.48" stroke with the 350.

And finally, about that nine digit stamping on the front of the block:

C52xxxxxx decodes as:

C = Chevy truck, 5 = 1975, 2 = the assembly plant where the truck was built (usually a letter, could it be a Z?). The last six digits would match the last six digits in the trucks VIN.

Hope this helps in some way

 

ditch the 350 and get ya something else. haha

 

Just run it. With a mild cam, manifold, and carb, it will do just fine.

 

Forgot to mention that your engine would have been backed by a manual trans. originally according to the code. I can't imagine that that would have any affect on the way the block was drilled for the starter, but who knows?

 

Than might solve part of it.
Speed gems
I'm not a car guy, but I've done triumph/harley/moto guzzi work , to ask. How do they get 305 cu. in. out of a
4 inch bore block with the same stroke as a 350 with a 4 inch bore?
5559
Had to go "feel", it's flat then a hump of rotten rubber,
then in.????
54nomore
Yer killing me, now I'm down to 145hp!! oh well
Still don't get the same stroke on a 350 and 305 with 4 inch bore. Some how i lost 45 cu. in.
Numbers
block 3970010
heads 3998991--C18A--M3
block stamp VOT30TXD
Thanks for the help Pat

 

The 305 does not have a 4" bore.

 

305 bore is only 3.736"

C 18 A (maybe C 18 4)? looks like a date code. Probably March 18, 1974 which could mean the heads have been replaced. Or it could be G 18 4 which would be July of '74 which could jive with a very early built '75 model.

And remember the 145 was a net rating probably closer to 200 gross. The numbers don't mean much anyway as long as the seat of the pants feel satisfies.

 

doesn't 327 have a 4 inch bore?

I had a similar issue with my 86/87 350 block.... Starter, flywheel... it was tough

 

The starter with the straight across bolts fits the small flexplate, the diagnal bolt pattern fits the large flexplate. You can use either flywheel on 265-350 engines, as long as the engine is neutral balanced and most engines are drilled to mount either starter. Since your engine originally came with a standard, it would have the flywheel changed over to a flexplate. Either one would bolt up, so it's not a way of identifying the engine.

 

Yep. 4 inch bore, 3.25 stroke.

I should have quoted mustang6147, but I've never used that function.
Hell, I'm still halfway Skeered of computers

 

3970010 is definitely a 350. I have an engine with the same block code. Mine is a 350 ci with 4 bolt main and it has the staggered starter holes.


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http://www.nastyz28.com/sbchevy/sblock.php

Go about halfway down the page.


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-------
Yes. Maybe this will help clear
your mind as to what is what.

282 - 3.67 Bore X 3.10 Stroke
265 - 3.750 Bore X 3.00 Stroke
267 - 3.50 Bore X 3.48 Stroke
283 - 3.875 Bore X 3.00 Stroke
302 - 4.00 Bore X 3.00 Stroke
305 - 3.736 Bore X 3.48 Stroke
307 - 3.875 Bore X 3.25 Stroke
327 - 4.00 Bore X 3.25 Stroke
350 - 4.00 Bore X 3.48 Stroke
400 - 4.125 Bore X 3.75 Stroke
--------------
Mart3406
==============

 

I thought ALL 350's swapped into anything were 'Vette engines? Does this mean if I put the 350 (that came in a '93 van) on my garage floor into something it's NOT a 'Vette engine? I was going to put aluminum valve covers on it and everything. Much sadness...

Brian

 

Sure, Brian, just like the 350 in the '91 van I drive as a beater is also a Corvette engine. Chevy just put it in my van by mistake. I can tell, because someone had to put a reman trans in it in the past.

 

I thought all 350's on the ground where vette engines ?

 

Hey, my 350 actually IS out of a corvette. I have the corvette to prove it. But I'm just going to tell folks it's out of a monza.

 

That casting number was used on more than just 350s......so that doesn't prove without a doubt it's a 350.


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Learned something new, I thought all '010' blocks were 350s. What other sizes did the 010 block get used for?

 

Starters for small block chevies come in straight and staggered holes. You buy one for whatever engine they list with straight holes. Not a quandry at all the starter does not care how many cubes you got it is a small block chevy, and an SBC is an SBC.

The engine size for a truck has no bearing on if the truck is light duty or not it has to do with how much the original buyer wanted to spend or what the dealer had on the lot. A half ton chevy is a half ton chevy, a 3 quarter ton is a 3 quarter ton and so one and so forth. unless you were to buy one of the '70s heavy chevies which was a towing/camper package and it was heavier springs mostly no major engine differences.

 

327s and I THINK some 302s.

 

Yes. A "010" casting number simply
means that the block was cast for and
machined with, a 4 -inch bore. Nothing
more nothing less.

Mart3406
===========

 

Knowing the year of the block helps. There was a point when they no longer produced 302s and 327s. Also decoding the vin is a good way to tell what the engine is and what it was destined to be bolted into.

None of this has any bearing on the starter though. GM made two classes of starters, standard and high torque. They both came in staggerd and straight bolt patterns. They also used the same starter on big blocks and small blocks.

Now that I have introduced the big block small block into the discussion here is a tid bit for you fellas, big block chebbies and small block chebbies have the motor mounts in the same location, they are the same distance from the bell housing to the motor mount and the length difference is in front of the motor mounts. So you can bolt a big block in place of your small block as long as you still have room for width and radiator clearance.

OK it is off topic but there is no charge for the info.

 

I have an "010" as well. Decodes to either truck or L-82 Vette, so I can actually say I might have the uber-desirable "vette motor". I probably won't though. L-82s were sorta lame IMO. I beat one once with SWB 74 Chevy van with a 350 2bbl

 

maybe I look at things different than most. Once you change the cam, intake, work the ports and etc it is no longer a "vette" motor, it is just another SBC.

The only reason a "Vette" motor would be more desirable is if you leave it stock so that it is a "Vette" motor.

I reworked a '57 "Vette" motor to go in a '55 stude once. It took .030 and .010x.010 to clean it up and by the time I was done the only thing "Vette" on it was the block and the turned crank. But the ol' stude ran low 12s on street tires and it never would have done that with the "Vette" motor.