Chrysler Poly-head V-8 is very large

Kinja'd!!! "Dash-doorhandle-6 cyl none the richer" (dash-doorhandle-and-bondo)
07/24/2018 at 18:35 • Filed to: None

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licence plate for scale.


DISCUSSION (9)


Kinja'd!!! Die-Trying > Dash-doorhandle-6 cyl none the richer
07/24/2018 at 18:57

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318?......383?.......


Kinja'd!!! lone_liberal > Dash-doorhandle-6 cyl none the richer
07/24/2018 at 19:07

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I like the description found in an article that describes how to mod them  https://www.hotrod.com/articles/mopp-0109-chryslers-poly-head-engine/  

Unfortunately, since the ’60s, the poly engine line has been “dissed” as little more than scrap metal, something to stick behind the garage since it was too heavy to tote away.


Kinja'd!!! jimz > Die-Trying
07/24/2018 at 20:06

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the most common displacement for the A Engine is 318 cubic inches. The A Engine is not the same 318 Chrysler used up through the ‘90s; this is an older architecture which has canted valves and “polyspheric” combustion chambers, kind of like the Ford 351 Cleveland.

The A Engine was dropped in 1967 and replaced with the LA (“light A”) series, which is the engine family (273/318/340/360) you’re familiar with that stayed in production until 2000-something. the LA Engine had conventional inline valves and wedge chambers.

the 383 was a different engine family, the big-block B Engine family.  The 413/426/440 was also in the B engine family but with a taller deck, thus called RB (for “Raised B.”)


Kinja'd!!! arl > jimz
07/24/2018 at 21:21

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So this one of those B blocks? Bore it out to 440 baby! Big cam! Headers! Nitrous! Hold my beer!


Kinja'd!!! jimz > arl
07/24/2018 at 21:26

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uh, did you read anything I wrote?  it’s an A engine. 


Kinja'd!!! Die-Trying > jimz
07/24/2018 at 21:48

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there we go........ i have seen the 318 polysphere, in just about EVERYTHING right around 1963-ish. everything from sportsfurys to the large dump trucks. and they are sure wide......

yeah, the LA have the distributors in the back like a chevy, and the B blocks have the distributors in the front, like the fords......

good heads up there, to keep things straight......


Kinja'd!!! jimz > Die-Trying
07/24/2018 at 22:15

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weeeeellll... the B/RB has the distributor up front, but it’s slanted like the Buick/Cadillac engines. ‘cept it’s slanted on the passenger side, opposite of the Buick/Caddy.

complicating things of course is the fact that Chrysler kept producing the AMC 360 V8 until 1991, which had the front-mounted distributor slanted towards the driver’s side like the aforementioned GM engines.


Kinja'd!!! Junkrat aka Rick Sanchez: Fury Road Edition > Dash-doorhandle-6 cyl none the richer
07/24/2018 at 22:25

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I have aquired three of these beasts over the years, too bad performance parts are non-existent. Intake choice is the big problem in my opinion. I’ve heard that some of the early hemi parts will fit, but that stuff is getting rare and expensive.


Kinja'd!!! arl > jimz
07/25/2018 at 09:29

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Long day man, long day....