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Chrysler,Dodge and Desoto early Hemi, what interchanges #713818
06/01/10 11:26 PM
06/01/10 11:26 PM
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DusterKrazy Offline OP
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I have a 331 Chrysler, does anything from the Dodge or Desoto Hemi's interchange with it as far as swapping parts around?

I also hear that a poly 318 can be converted to a Hemi by bolting on the heads from a Dodge 315??


"The perfect LS swap involves a dumpster"
Re: Chrysler,Dodge and Desoto early Hemi, what interchanges [Re: DusterKrazy] #713819
06/02/10 01:31 PM
06/02/10 01:31 PM
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Very little interchanges.You can make a hemi from the old 354 Chrysler poly block.The 318 poly I believe you cant.Rocky

Last edited by therocks; 06/02/10 01:31 PM.

Chrysler Firepower
Re: Chrysler,Dodge and Desoto early Hemi, what interchanges [Re: therocks] #713820
06/02/10 09:49 PM
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Quote:

Very little interchanges.You can make a hemi from the old 354 Chrysler poly block.The 318 poly I believe you cant.Rocky




I thought the 354 Chrysler was a Hemi??

What about the spark plug tubes??Any interchange?


"The perfect LS swap involves a dumpster"
Re: Chrysler,Dodge and Desoto early Hemi, what interchanges [Re: DusterKrazy] #713821
06/03/10 02:33 PM
06/03/10 02:33 PM
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Marietta, GA
Joatha Offline
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Quote:

Quote:

Very little interchanges.You can make a hemi from the old 354 Chrysler poly block.The 318 poly I believe you cant.Rocky




I thought the 354 Chrysler was a Hemi??

What about the spark plug tubes??Any interchange?




There was both a 354 Hemi and a 354 poly. You can make a hemi out of the poly.


1966 Barracuda 1968 Barracuda convertible 1930 Ford Model A (soon to be hemi equipped) 2006 Dodge 3500 4X4 CTD Quad Cab
Re: Chrysler,Dodge and Desoto early Hemi, what interchanges [Re: Joatha] #713822
06/03/10 03:20 PM
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Quote:

Quote:

Quote:

Very little interchanges.You can make a hemi from the old 354 Chrysler poly block.The 318 poly I believe you cant.Rocky




I thought the 354 Chrysler was a Hemi??

What about the spark plug tubes??Any interchange?




What years for the 354 poly?

There was both a 354 Hemi and a 354 poly. You can make a hemi out of the poly.




"The perfect LS swap involves a dumpster"
Re: Chrysler,Dodge and Desoto early Hemi, what interchanges [Re: DusterKrazy] #713823
06/03/10 05:10 PM
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if you look at the 3 motors you will see that they are different sizes wider longer in the dodge the 241 hemi and the 270 are both the same block so part will enterchange they are both low deck motors then the dodge also built a hight deck block desoto did the same thing like there low motors were 330 and 341 then you had the high deck and not much will work from dodge to desoto or to the chrysler motors

Re: Chrysler,Dodge and Desoto early Hemi, what interchanges [Re: cuhemida] #713824
06/04/10 12:32 AM
06/04/10 12:32 AM
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levittown pa
fstfish66 Offline
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the 318 is an A ENGINE poly,,not to be confused with the 318 LA motor,,but a few internals are the same,,as far as i know the 318 A poly does not fall under the catogory of the early poly motors,,the 318 A poly came in around 1959 till 1966, that block is more like a LA motor

the 1953 thru 1956 poly motors are differnt and are the base for the same year hemis,,,

dodge polys share the same block crank rods as the dodge poly of those years these can be converted to a HEMI by switching to hemi heads and pistons,every thing else is the same,.

same for the desoto poly/hemis

and the chrysler 1953 thru 1957 hemi/poly.,.

none of the parts interchange from dodge to desoto or to chrysler they are all seperate familys,,,thats why production of these great motors stopped,,nothing was the same and too costly at the time to keep producing 3 competely differnt engine lines,,,

i dont know how many if any of the same vintage plymouth poly motors have any thing in common with the dodge polys,,i know some of the cubic inch are not the same as dodge,,,

some distributors and oil pumps can be made to intrerchange


1966 barracuda prostreeter super charged 340(SOLD)
1940 dodge coupe 241 hemi street rod
2014 ram express hemi 4x4 dailey driver
2015 cherokee
2013 R/T classic
Re: Chrysler,Dodge and Desoto early Hemi, what interchanges [Re: fstfish66] #713825
06/04/10 02:11 AM
06/04/10 02:11 AM

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All right, we've been through this before, but I guess I need to do it again.

Key to understanding early hemi and poly engines it that Chrysler decided to copy what was the GM practice at the time, in which each division developed its own engine line. So four separate engine families were developed, in which virtually nothing interchanged from one family to the other.

First Chrysler OHV V-8 came out in 1951.

Then De Soto in 1952.

Then Dodge in 1953.

And finally Plymouth in 1956.

They each have their own bore center-to-center distances and so cranks, cams, heads and blocks do not and cannot interchange one from the other, as they are not and cannot be the same length.

Chrysler, De Soto and Dodge engines were developed as Hemis. Later, poly versions of the Dodge and Chrysler engines were developed. There was never a De Soto poly.

Chrysler and Dodge poly engines can be converted to hemis by swapping heads and related items, but only Dodge to Dodge or Chrysler to Chrysler.

The Plymouth V-8 was developed as a poly engine. There was never a Plymouth-specific hemi engine (the later 426 hemi was used by both Plymouth and Dodge). Plymouth poly engines cannot be converted to hemis.

However: Because its own V-8 wasn't quite ready for the 1955 model year, all 1955 and some 1956 Plymouth V-8's were actually Dodge poly engines, and these can be converted to hemis by using Dodge hemi heads.

Also: The lowest-priced 1957 De Soto models used Dodge poly engines, and these too can be converted to hemis, using Dodge hemi heads.

And finally: There was a very limited run of HP 57 Dodge D-501's that had 56 Chrysler 300 engines; i.e., dual-quad 354 hemis.

(Clearly, by the mid-50's, Chrysler Corp. was already moving away from a strict each-division-gets-its-own-engine mentality.)

The original Plymouth poly of 1956 had 277 cubic inches. Fury models introduced late in the model year used Canadian 303-inch Plymouth poly engines, which were essentially a 277 Plymouth poly with a .060 larger bore and a longer 3.31 stroke. For 1957, Plymouth poly engine choices were 277, 301 and 318. The 318 was a larger-bore version of the previous year's 303 and used the same crank. The 1957 301 used a 318 bore size with a 277 crank.

Externally, 277's, 301's, 303's and 318's look identical.

(BTW, there was a 301 Chrysler poly in 1955, but it is a completely different engine than the 301 Plymouth poly.)

In 1959, Dodge phased out its old hemi/poly and began using Plymouth poly engines with a .040 larger bore to make it a 326 incher (the Dodge was a mid-priced car and needed a bigger engine than the low-priced Plymouth). The 326 was a one-year-only version of the Plymouth-designed poly motor. Next year the base V-8 for both Dodges and Plymouths was the 318 poly, with 361 and 383 big blocks optional.

So the Plymouth poly evolved into the corporate standard V-8, and was also the basis for the later small-block 273, 318, 340 and 360 wedge V-8's, all of which share the same bore center-to-center distance and other critical dimensions with the old Plymouth poly.

Here's a picture of the 277 poly in my 56 Plymouth Belvedere:



That clear things up??

Re: Chrysler,Dodge and Desoto early Hemi, what interchanges #713826
06/04/10 11:21 AM
06/04/10 11:21 AM

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Bore center-to-center distances for Mopar V-8's are:

Dodge hemi and poly - 4.1875

DeSoto hemi - 4.3125

Plymouth poly - 4.46 (same as the LA small block)

Chrysler hemi and poly - 4.5625

Mopar big block wedge and 426 hemi - 4.80

Re: Chrysler,Dodge and Desoto early Hemi, what interchanges #713827
06/04/10 05:34 PM
06/04/10 05:34 PM
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Well said, I couldn't of even gave that specific info. As a matter of fact I just saved that in a file. I basically had researched most of that out about the interchangeability of them about 8 or so years ago.

I do know that a LA distributer will fit a low deck Dodge Hemi. I've got a 273 points dizzy in my 241 Hemi.


Moparlee
Re: Chrysler,Dodge and Desoto early Hemi, what interchanges [Re: Robbins] #713828
06/04/10 08:44 PM
06/04/10 08:44 PM
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a very good book on the early hemi's is :
tex smith's "the complete chrysler hemi engine manual" by ron ceridono. it has a ton of identifying pics and covers the poly to hemi conversions. well worth reading in my opinion.

Re: Chrysler,Dodge and Desoto early Hemi, what interchanges [Re: moparx] #713829
06/04/10 09:52 PM
06/04/10 09:52 PM
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Quote:

a very good book on the early hemi's is :
tex smith's "the complete chrysler hemi engine manual" by ron ceridono. it has a ton of identifying pics and covers the poly to hemi conversions. well worth reading in my opinion.





I bought that book too.


Moparlee
Re: Chrysler,Dodge and Desoto early Hemi, what interchanges [Re: Robbins] #713830
06/04/10 11:07 PM
06/04/10 11:07 PM
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DusterKrazy Offline OP
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Does a small block timing chain fit the Chrysler hemi's??

What oil pan would I need to swap a 331 into a b body??


"The perfect LS swap involves a dumpster"
Re: Chrysler,Dodge and Desoto early Hemi, what interchanges [Re: DusterKrazy] #713831
06/05/10 09:22 AM
06/05/10 09:22 AM

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Quote:

Does a small block timing chain fit the Chrysler hemi's??

What oil pan would I need to swap a 331 into a b body??




http://www.hothemiheads.com/

Re: Chrysler,Dodge and Desoto early Hemi, what interchanges #713832
06/12/10 05:04 PM
06/12/10 05:04 PM
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DusterKrazy Offline OP
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So..

I should locate a 53-57 Chrysler poly...

What are some body styles to look for that could contain a 331 or 354 poly??


"The perfect LS swap involves a dumpster"
Re: Chrysler,Dodge and Desoto early Hemi, what interchanges [Re: DusterKrazy] #713833
06/12/10 05:56 PM
06/12/10 05:56 PM
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Hawley, Texas
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Windsor, Saratoga, and poss Newport. Will more than likely be a poly engine. 55s will be the 301, 56s will be a 331 and 57-58s will be a 354 if original. I had a 331 poly years ago, had it in a 56 DeSoto and it was last seen in a 59 Dodge Panel Town Wagon. I may still have the 2 bbl intake as I got a factory 4bbl intake w/WCFB (a fun rebuild) and put it on. It has been gone 30 years or more.
Bryce


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Re: Chrysler,Dodge and Desoto early Hemi, what interchanges #713834
08/04/10 02:26 AM
08/04/10 02:26 AM
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Pittsburgh,PA
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Good info 413!An easy way to spot a poly with hemi potential is the existence of a bolt on lifter valley tray under the intake.The 318 poly and it's earlier variants use the intake manifold as a lifter valley cover(similar to later LA small blocks).When you find a poly with a valley tray,you can further ID it by either the stamped pad in front of the intake and by casting numbers.Most if not all block casting numbers are on the back of the block in the bellhousing area.This can be difficult to see if the trans is attached!You can find casting numbers at Thehmi.com or hot head website,some poly and hemi blocks carry the same casting number.The actual use of the engine is on the stamped pad. http://www.thehemi.com/castings.php
RT

Re: Chrysler,Dodge and Desoto early Hemi, what interchanges [Re: RTSrunner] #713835
08/20/10 04:34 PM
08/20/10 04:34 PM
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Maybe this is a dumb question..but what of the so-called "wide block" 318 Poly? Is it the same block as the LA? Is it the heads that make the poly look so wide?

Re: Chrysler,Dodge and Desoto early Hemi, what interchanges [Re: B1Fish540] #713836
08/24/10 01:18 AM
08/24/10 01:18 AM
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the poly 318 was from 1959 i believe till 1966.after 1967 it is what we know as the LA motor,,

the poly head uses a staggered valve set up, some parts are interchangable to the LA,, oil pan i believe and dizzy,,same timing cover i belive.

go to allpar.com you can read about it there,,,

i have always thought these motors put out more power then a LA type 318,and there seems to be a ton of intrest down under,,also i believe you would find some poly 318 guys on the H.A.M.B.

not to be confused with the early poly motors of the mid 1950s, totally different blocks,,

Last edited by fstfish66; 08/24/10 01:30 AM.

1966 barracuda prostreeter super charged 340(SOLD)
1940 dodge coupe 241 hemi street rod
2014 ram express hemi 4x4 dailey driver
2015 cherokee
2013 R/T classic
Re: Chrysler,Dodge and Desoto early Hemi, what interchanges [Re: fstfish66] #713837
08/25/10 12:59 AM
08/25/10 12:59 AM
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Pittsburgh,PA
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At the scrapyard yesterday,getting rid of real scrap,I spot a 318 poly in the truck next to me.I said to the guys wife that is worth more than what they'll give you for it here(maybe),she says yeah.As they weigh it,I say to the dude,that's a 318 poly Chrysler.Dude says it's a 383, dist hole in rear,wavy 2-bolt valve covers,manifold sealing the valley,it's a poly 'teen.I tell him I have been moving Mopar engines all week as I move garages,he asks if I have some motors for him!Sorry scrapper,mine are not junk!Get back in your GMC and be on your way!Some things are worth more than what they weigh in my opinion.Wonder who told him it was a 383,30 years of Mopars I can tell the difference!Makes me wonder how many have scrapped some rare motors.
RT

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