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Poly Performance
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wheelcover
Posted 2019-05-09 6:34 PM (#581980)
Subject: Poly Performance


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Posts: 103
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Location: Wyoming
Anyone ever dealt with this company or their parts?
https://cpwebstore.com/Poly
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wayfarer
Posted 2019-05-13 11:01 AM (#582100 - in reply to #581980)
Subject: Re: Poly Performance



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Yes. Questions or concerns?

...and what part of Wyoming?

.

Edited by wayfarer 2019-05-13 11:02 AM
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wheelcover
Posted 2019-05-13 5:55 PM (#582116 - in reply to #582100)
Subject: Re: Poly Performance


Veteran

Posts: 103
100
Location: Wyoming
No questions or concerns, just thought it was cool that performance parts were being manufactured for the poly engines. Read earlier that someone was looking for headers - saw this website had some. Any other good resources for poly performance parts I should know about?

I’m in Laramie.
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wayfarer
Posted 2019-05-16 11:41 AM (#582192 - in reply to #581980)
Subject: Re: Poly Performance



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There is a forum dedicated to the Poly and certain associated cars http://www.1962to1965mopar.ornocar.com/poly318.html
IMHO it can be a bit of a challenge to navigate but one of the guys, Gary Pavlovich, is considered the Poly expert by many.

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wheelcover
Posted 2019-05-21 10:21 AM (#582359 - in reply to #581980)
Subject: RE: Poly Performance


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Posts: 103
100
Location: Wyoming
Thanks, I’ll take a look.
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Manifest Predicament
Posted 2022-02-19 4:34 PM (#619565 - in reply to #581980)
Subject: RE: Poly Performance



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Posts: 30
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Location: Sioux Falls, SD
Thanks for the Poly links. The 56 Windsor T&C Wagon I bought was sold as having a 354 Hemi. I bought it sight unseen - Well sent a Corvair guy who used to be the president of the national club to look at it for me. I had it shipped to my dads so later I can recover it (in April) driving it from Vegas to Sioux Falls if I make it!
Anyway it looks like a Hemi. Has 354 heads, intake and water pump. My dad finally got me the block number so now I know. Turns out it is the factory 331 Poly block.. But I'm not upset. I got a great deal and love it. And the poly is really best for me anyway if I convert it back,.,. That said I did read elsewhere about the issues if one just slaps hemi heads on a poly w/o proper work (dome overlap, etc) so it will be interesting to learn what all was done or not done. But they fooled me too from the photos - things I was looking for - generator bracket and power steering pump, idler pulley, water pump, exhaust manifolds, WCFB and intake manifold all proper for the 56 354.

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Powerflite
Posted 2022-02-19 6:29 PM (#619572 - in reply to #581980)
Subject: Re: Poly Performance



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Those links don' t deal with the Chrysler 354 or 331 poly motors. Those links are only for the Plymouth "A" poly, which are 277, 301, 303, 318, 326. They don't have a gap under the intake manifold and almost nothing interchanges between those motors and the Chrysler 331 or 354. Hopefully, they put hemi pistons into your motor before they swapped heads, otherwise it will be lacking in compression.
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ttotired
Posted 2022-02-19 6:31 PM (#619573 - in reply to #619565)
Subject: RE: Poly Performance



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Another that has fallen into the poly trap
There are 2 types of poly engine and they have almost nothing to do with each other

Do some googleing and you will see, but the poly that moparweb or CP performance cater for is the "A Poly"

You can not fit hemi heads on an A Poly

Your engine is the true "Semi Hemi" because it was based on the hemi block with cheaper heads (and some other different stuff) fitted

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Manifest Predicament
Posted 2022-02-20 7:30 PM (#619614 - in reply to #619573)
Subject: RE: Poly Performance



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Posts: 30
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Location: Sioux Falls, SD
Yes and thank you, I've recently been learning that. I realize 57 and up engines are a whole other matter.. But I'm primarily only interested in these 55-56 engines/cars. Desoto in particular. And I know about the low compression issue if the domed pistons weren't included which may actually work for me. We'll deal with than when I can get down there to scope it out but they obviously put some effort into this engine to upgrade the intake (no heater hose ports), water pump and even a PCV system.. If it's lower compression though I wonder how much timing advance I can dial in and if it will be alright on any fuel. I really can't wait to find out but have a month and a half to get more parts and research.. It will be a lot of fun that's for sure!! 1400 drive home.

This link above I did learn a lot though https://www.qualityengineeredcomponents.com/

And those other two after I opened them I realized they were of the later A or 318 series. We had one in the late 80's. But there is a story oddly on CP Performance about "POLYSUPERPAC.com is excited to announce new life for old Polys... The original ‘A’ engine, (aka Poly), was introduced in 1956 as a significant replacement for the Hemi of that era..."
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56D500boy
Posted 2022-02-20 7:54 PM (#619615 - in reply to #619614)
Subject: RE: Poly Performance



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.
More Poly info at PolyJ's (Justin L's) website:

http://poly318.com/

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Powerflite
Posted 2022-02-20 9:25 PM (#619618 - in reply to #619614)
Subject: RE: Poly Performance



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Manifest Predicament - 2022-02-20 4:30 PM
...But there is a story oddly on CP Performance about "POLYSUPERPAC.com is excited to announce new life for old Polys... The original ‘A’ engine, (aka Poly), was introduced in 1956 as a significant replacement for the Hemi of that era..."


Don't believe everything you read. The "A" poly was never considered a replacement for the hemi motor. In truth, the big block wedge motor replaced the hemi - it did so in the Chryslers the DeSotos, and for the high performance D500 Dodge. The "A" poly started out as the Plymouth V8 engine and Plymouth never received a hemi until the mid-sixties. The "A" poly was eventually used in Dodge in '59-up, but took the place of the Dodge poly, not the hemi motor.
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Manifest Predicament
Posted 2022-02-22 8:26 PM (#619696 - in reply to #581980)
Subject: Re: Poly Performance



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Location: Sioux Falls, SD
Quite interesting data. Looks like Chrysler eventually took the lead in standardizing things between divisions eventually.. This thread relates to all of this. https://board.moparts.org/ubbthreads/ubbthreads.php/topics/2584566/1...
So now I can't wait for April when I get way south and look into the quench area - what pistons are indeed installed. Just seeing the PCV system on there among other things maybe it's a Hotheads supplied rebuild.
By the way - just found a nice 56 DeSoto "ran when parked" near Tulsa I'd like to check out on my way home. A woman's fathers car parked a decade ago due to health problems. A garage find buried in cakes of dust.
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Powerflite
Posted 2022-02-22 10:29 PM (#619703 - in reply to #581980)
Subject: Re: Poly Performance



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Interesting that in the thread, he measures the chamber volume of a 301 Chrysler poly head to be the same 100-102cc as the 331 hemi head. So swapping those sets of heads won't change the compression. But I looked it up and found that '56 Chrysler poly heads have a different part number, as do '57-'58 poly heads. So the chamber volumes on them could be different.
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Mopar1
Posted 2022-02-23 10:52 AM (#619717 - in reply to #619703)
Subject: Re: Poly Performance



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Powerflite - 2022-02-22 9:29 PM

Interesting that in the thread, he measures the chamber volume of a 301 Chrysler poly head to be the same 100-102cc as the 331 hemi head. So swapping those sets of heads won't change the compression. But I looked it up and found that '56 Chrysler poly heads have a different part number, as do '57-'58 poly heads. So the chamber volumes on them could be different.
The bores are different so the combustion chambers would be wider as bore size goes up, different part numbers.
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Mike P
Posted 2022-03-10 11:38 PM (#620172 - in reply to #581980)
Subject: RE: Poly Performance


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Mopar1 and Powerflite you are both right. I’m the guy who was playing with the HEMI to Poly head swap. It looks good on paper as while the HEMI makes more HP the Polys’ make more torque.

The show stopper for the poly swap was that the 301 combustion chambers overhang the cylinder. I also came across the part number difference so I assume that like you the engines use distinct heads based on bore size.

Combustion chamber size is one of those things where you actually need to CC the heads you are planning on using to see where you are going to be compression wise.

I actually pulled 2 pair of 1955 301 poly heads when I started this. The pair I wrote up had the casting number followed by a -1 and the second pair was the casting number followed by a -2. As one of the -2 heads was cracked I only measured one of them and it came out a little bigger (by about 7cc as I recall) than the -1 heads.

I also cc’d a pair of 354 HEMI truck heads which came out about 10 cc larger than the triple nickel 55 heads.

I never got as far as seeing if there was going to be an issue with the valve relief notches in the pistons. They are in different locations on the HEMI pistons compared to the POLY pistons. I suspect depending on piston pin height, cam grind and valve size the HEMI heads on poly pistons might not have been an issue. Bigger cam and/or oversize valves would have been a situation where all bets are off however.

As it stands right now, the rotating assembly came back from the balancer Monday so I’m currently assembling my engine as a HEMI.

Manifest Predicament if you do swap it back to Poly heads the intake will also fit the Poly heads. The Hot Heads intake manifold I bought for my project didn’t have the rear port for a heater hose either but it was a simple matter to drill and tap the rear port for a ½ NPT fitting.


[img]https://live.staticflickr.com/65535/51901374317_5deaa3345c_z.jpg[/img]HHI2 by M Patterson, on Flickr

You will need Poly exhaust manifolds as they are different than the HEMI manifolds. The head bolts are different and you will also need a set of pushrods. From what I determined when I was researching this project the short (intake) adjustable pushrods for a 331/354 hemi that hot heads sells will work.


.


Edited by Mike P 2022-03-11 9:30 AM
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Chrome58
Posted 2022-03-11 2:01 AM (#620174 - in reply to #581980)
Subject: RE: Poly Performance



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wheelcover - 2019-05-10 12:34 AM

Anyone ever dealt with this company or their parts?
https://cpwebstore.com/Poly


This website sells parts that have been designed by a team of people, including Gary Pavlovich.
I second the fact that Gary is THE expert on (early) Poly performance.
Furthermore, I know him personally, and I can tell you he's a great guy too!

I would recommend to get in touch with him and discuss your needs with him.
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Mopar1
Posted 2022-03-11 3:52 PM (#620184 - in reply to #620172)
Subject: RE: Poly Performance



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Mike P - 2022-03-10 10:38 PM
I never got as far as seeing if there was going to be an issue with the valve relief notches in the pistons. They are in different locations on the HEMI pistons compared to the POLY pistons. I suspect depending on piston pin height, cam grind and valve size the HEMI heads on poly pistons might not have been an issue. Bigger cam and/or oversize valves would have been a situation where all bets are off however.
Reports seem to show that lo-po truck engines have been found from the OEM with hemi heads on poly pistons & vice versa. Apparently with the low C/R & lo-po cam there wasn't interference. Probably wouldn't be the case with hi-po pistons & cam
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PolyJ
Posted 2022-05-21 2:02 AM (#621634 - in reply to #620174)
Subject: RE: Poly Performance



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Chrome58 - 2022-03-11 12:01 AM
wheelcover - 2019-05-10 12:34 AM Anyone ever dealt with this company or their parts? https://cpwebstore.com/Poly
This website sells parts that have been designed by a team of people, including Gary Pavlovich. I second the fact that Gary is THE expert on (early) Poly performance. Furthermore, I know him personally, and I can tell you he's a great guy too! I would recommend to get in touch with him and discuss your needs with him.

 

For what it's worth to others, Gary parted ways with Chrysler Power years ago after developing the Wind Tunnel intake with the foundary owner Javier Vasquez.

 

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PolyJ
Posted 2022-05-21 2:05 AM (#621635 - in reply to #619615)
Subject: RE: Poly Performance



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56D500boy - 2022-02-20 5:54 PM . More Poly info at PolyJ's (Justin L's) website: http://poly318.com/ :)

Dave, thanks for the plug. I'm cracking up because all along I've been scrolling past this forum thinking it only dealt with exhaust topics I've found my new home

 

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wayfarer
Posted 2022-05-22 7:08 PM (#621667 - in reply to #581980)
Subject: Re: Poly Performance



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...some of these guys can be very exhausting.....
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PolyJ
Posted 2022-05-22 9:25 PM (#621670 - in reply to #621667)
Subject: Re: Poly Performance



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wayfarer - 2022-05-22 5:08 PM ...some of these guys can be very exhausting.....

Lol. Poly performance enthusiasts, exhaustively so.

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