Mopar Poly speed parts, whats available?

Whats out there for dress up and speed parts?What was available back in the day?Lets see photos of what you have!

 

look up the back issues for mopar muscle, they did a poly build up awhile back

 

Which MoPar poly?

 

All from the 50'S-mid 60's

 

"All from the 50'S-mid 60's"
No, need an answer. In that time period, there are:
1. Plymouth and Dodge poly "A" engines (1956-67 277, 301, 303, 313, 318, 326), most popular and newest
2. Dodge, DeSoto and 1955-56 Plymouth engines (1955-58 low-deck 241, 259, 270; high-deck 315, 325)
3. Chrysler Spitfire engines (1955-58 301, 331, 354)
Almost no parts and no speed equipment interchanges between them.

http://victorylibrary.com/POLY.htm

 

yup, parts are tough to find.. So far for my poly 318 I have found a 3-2 intake and carbs, purple cam, forged pistons, muncie four speed bellhousing to mate to it.. Jason.

 

OK then Plymouth and Dodge poly "A" engines.Sorry I don't know shit about the poly motors,all ever messed with is big blocks and late model Hemis.Excuse my ignorance.

 

3. Chrysler Spitfire engines (1955-58 301, 331, 354)
Almost no parts and no speed equipment interchanges between them.

I'm no expert but just add Hemi pistons and heads to any of these engines and now they are Hemi's? No?

 

Oh no.

 

Pistons, heads, pushrods, sometimes the intake and exhaust manifolds, and the parts must be from the coresponding make/size Hemi. Note that this DOES NOT work on the A series polys as they have no Hemi counterpart.

With enough patience, you can find factory 2x4 intakes for the As, and the occasional set of headers. Edelbrock used to make finned valve covers too. Standard Mopar 318/340 distributers fit if you want an ignition upgrade. 340 cranks will fit with some minor work if you want a stroker. Even if your not looking to go wild, I very highly recomend PANIC's Victory Library Poly book linked above. It's loaded with usefull information and interchanges.

 

while i have never used this guy...he seems to be there when a poly is the deal.
i know of a few cars ive read about with his engines or experience..
the only one i know of that is still hopping them up...
best of luck
cheapst.
http://www.moparmecca.com/Poly%20Engines.html

this is the home page
http://www.moparmecca.com/

 

Own a '59 Dodge w/ a 326 poly and am in the market for a edelbrock P-600 3x2 set-up. Any help is apreciated.
Bart

 

340 has same stroke as 318, cut the mains on a 360 crank to stroke the 318 Poly.

 

Gary Pavlovich wrote two Mopar Muscle Magazine articles, Sept. 2001 and Oct. 2001 issues on the Poly 318 build-up, using a 1962 Poly 318 block .090" and a Mopar Performance 4" stroker crank to create a 402 cubic inch Poly. The peak numbers in the article were 405HP @ 5600rpm and 442 Torque @ 4400rpm, which are correct; however, these HP/Torque numbers were without any tuning, extremely lean 17 A/F ratio numbers, and a severe exhaust restriction in custom headers (collector collapsed in half for #1 & #2 cylinders) just to clear the dyno/starter obstruction.
Article deadlines did not allow for "tuning" the Poly to its peak; approximately 430HP and 450 Torque.

290/.492 hydraulic Cam, 10.1 to 1 compression, Weiand single four intake...

The Poly heads were ported & polished to a modest 211/150 cfm intake/exhaust @ .500" lift.

Even with the uncorrected maladies outlined above, the Poly had a very high/flat HP/Torque curve and blew away a bigger cam'd, higher compression, better header'd, Edelbrock heads, and Air Gap intake 360 motor that was later dyno'd.
The "untuned" Poly made over 400ft.lbs. of torque to 5200rpm and still pulled 397HP @ 6000rpm;
from 3700rpm - 4600rpm average torque was 436ft. lbs. and from 4400rpm - 6000rpm average HP was 391.

The Poly 318 obviously has great power potential and makes more HP/Torque with less compression and head flow than a LA motor because of its superior head design; BMEP (brake mean effective pressure) for a Poly 318 with restrictive "log style" exhaust manifolds is approx. 164 PSI.

We now have new performance camshafts and TTI headers available for Poly 318; Weiand has since DC'd their Poly intake.

Many LA parts interchange with the Poly 318 (*slight differences with the 57-61 extended crankshaft flange engines);
distributor, *crank, rods, bearings, timing chain, *timing chain cover, oil pan, water pump, *oil pump, lifters, pushrods...

 

Working on a Poly?

Come see us at http://www.geocities.com/polyman64 !

The Polyspherical Engine Association has info, and a business directory on where to get parts, as well as what parts are available. If you don't see what you're looking for, Gary in the Yahoo Group can get it for you. Need more info? Check out the Poly Yahoo Group:
http://autos.groups.yahoo.com/group/318poly/

Or the Poly Forum:
http://www.diamondbackengines.com/forums/index.php/board,6.0.html

By the way, don't forget Victory Library's Poly books - a great resource! http://victorylibrary.com/POLY.htm
Panic writes 'em - he's a HAMBer.


~Jason

 

Hey there. I’ve just bought a 55 Belvedere and am new to mopar. How about leads to speed parts on a 241poly? Seems there is nothing out there at all?

 

241/270 hemi intakes will work. Or convert it to Hemi.

 

...not sure what the current status of the Offenhauser manifolds happens to be, but an option.
'Speed parts' is a different story. There is little to be done without a full rebuild. Remember that you are starting with 7:1 c/r and that affects everything else.
Allow me to plant a 'seed'......all of the pre-62 Hemi-Poly and A series engines have the same crank flange and bell housing bolt pattern. 392 maybe?

 

How about dual quads? The price is in Canadian funds, about $390 in 'Mercan money.
https://www.kijiji.ca/v-engines-and...mopar-318-poly-2x4-intake-manifold/1580317209

 

Gary, what happened to the stuff "Chrysler Power" was selling (the 4 BBL: manifold and valve covers)? I know they existed, because I as able to get a manifold from them (with your help, thank you), but I believe Roland had passed.

Did anybody pick up that operation? I see the link to the website no longer works.

 

I see. I did think about getting block sonic tested for wall thickness and if ok take it to 270 with a low end power cam. A std size 270 engine kit is approximately $2000USD including freight back home here. Maybe I just give her a freshen up, add a cam and a 350 Holley and save up for a stroker 318 build with a few more goodies in it.

 

Sorry, my engine is the previous generation.

 

Ha. Plant away! Thought I’d start at the diff and work my way forward with that sort of rebuild! Be a great combo for daughter to get her licence in when the time comes though…

 

That's for the "A" Polys.

 

The Poly I had in 1965-1966 had the factory dual quad manifold. They were small CFBs. You would be better off with an aluminum manifold and a larger single carb. I ran an Isky cam an Headman headers which were available new then. It was also bored .060 and I think the pistons were Jahns which I got from S&S Speed in Richmond Hill. It ran pretty nice. It also had chrome rocker covers which also were available new back then.

 

Oh yeah, it was a 318 Poly.

 

You're sure it's a 241, not a 259? The '55 241 Poly is advertised at 7.6:1, but the advertised C/R on low deck hemis tend to be optimistic, haven't seen anything on the Poly.

 

Apparently yes. So it’s a Canadian car. I’ve yet to land the thing here in NZ to check numbers. But from the info I have on it it’s one of the first batch of poly V8’s which only ran for a year. Hence in potentially being a thin wall block and not being able to be bored bigger like the 55-56 onward blocks were.

 

Actually the low blocks, with sonic check, can typically be bored .125. The 259 Poly was an option in '55 also, at least in the US. Everything except the complete head assembly's (inc. ex mans.), pistons & cam is same as the hemi

 

The only address that I have at this time is [email protected]
Hopefully someone will answer an email.