Re: OT 354 poly

[MO <micher@xxxxxxxxxxxxxxx>]

 Their are several versions of the poly engines. Poly refers to the
shape of the head combustion chamber design.  Some of the Chrysler and
dodge hemis used the same blocks  as their poly counterparts. Just
making the Hemi  heads fit engines they already had. ..............MO

On Jul 20, 6:08 am, Bill Paxton <w...@xxxxxxxxxxxx> wrote:
> What is the difference between the polys? Why can some use hemi heads and the 318 version can't?
>
> There are many versions of the poly engine. Poly refers to the shape of the heads combustion chamber design
>
> -----Original Message-----
> From: 1962to1965mopars@xxxxxxxxxxxxxxxx [mailto:1962to1965mopars@xxxxxxxxxxxxxxxx] On Behalf Of Gary H.
> Sent: Wednesday, July 18, 2012 8:14 PM
> To: 1962to1965mopars@xxxxxxxxxxxxxxxx
> Subject: Re: OT 354 poly
>
> Yes. Not all polys convert though.  "Chrysler's 301, 331, and 354 polys and Dodge's 270, 315 and 325 polys can easily be converted to hemis by adding the proper heads, intake and exhaust manifolds. It is important to understand that polys can be converted to hemis only within an engine family. Chrysler polys accept Chrysler hemi heads, Dodge and early Plymouth polys will accept Dodge hemi heads. DeSoto never produced a poly head motor so DeSoto hemi heads won't work on anything but a DeSoto hemi. (The 325 ci. Firesweep Poly head motor installed in some 1957 DeSotos were actually Dodge motors built in the Dodge engine plant.)"http://www.hotrodsandhemis.com/poly.html
>
> So the 318 Poly family of A engines had no Hemi motor based on it. So Hemi heads would not fit those polys.
>
> Thanks,
> Gary H.
> >  -------Original Message-------
> >  From: John Knox
> >  I wasn't too clear.  The early Hemi had a different bellhousing bolt
> >  pattern than a big block.
>
> >  On Jul 18, 2012 6:44 PM, "John Knox"  wrote:
> >  The 354 poly motor used the same bellhousing as the Chrysler Hemi. And
> >  indeed,you could turn the poly into a Hemi; my father did just that for his
> >  AA/FA.
>
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