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Author Topic: Difference in Engines  (Read 9680 times)

James Brown Jr,

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Difference in Engines
« Reply #45 on: October 04, 2007, 08:04:46 PM »

wow not whats some thing i didn't know. 331 poly with Hemi heads??
lol wow. i guess you learn new thing every night
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Snotty

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« Reply #46 on: October 05, 2007, 09:18:18 PM »

Yes, Chrsler made two different 331 - 354s for the matter - the only difference was one had the hemispherical combustion chamber heads, and the other had a polispherical combustuion chamber head.  The heads mount the same for both motors, which is why all you need are the pushrods.  One bank of rods - either the intake or exhaust - were shorter on the poly motor, so a person needs the hemi pushrods.
 
The same can be done for the Dodge 315 and many other of the early hemis.  But not the 318!  It uses an entirely differnet intake that wll not mate with the hemi heads, nor can it be made to do so.
 
Tater, if you look at an early 316, say in a '65 Dodge, look at the valve covers and you will see they are "Sculpted" due to the combustion chamber.  The same for the early poly motors.
 
They're great motors!  But, just like modern 318s or even 383s, people will trip over them looking ofr a 440 or a hemi.
 
Oh, why won't a 426 hemi head fit on a 440, or any B/RB block?  SImilar to teh early 318, they use completely different intakes, but also they use Allen-head bolts that come from under the head, not from the top.  There's no way to make them fit.
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Mike

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« Reply #47 on: October 06, 2007, 09:38:07 AM »

Thanks a lot Snotty, thats the info I was looking for!

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Stitcherbob

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« Reply #48 on: October 06, 2007, 07:44:05 PM »

Jeeze, it passed unnoticed that Polaraco said the new Hemis are overhead cam......the multiple cylinder shutdown on the 5.7L Hemi is activated by the shutting down of LIFTERS in the BLOCK....the PUSHRODS don't actuate the ROCKERS after that.....
 
Oh, and the easiest way to think about the original question is that the early Hemis were comparable to the 340 engines while the 426 Hemi was comparable to the 440 wedges in block size and design.....placement of distributors, oiling, deck height, etc.
 
Tex Smith's book is the bible for these engines and also offers a polysphere rebuild section.
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Snotty

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« Reply #49 on: October 08, 2007, 11:23:10 AM »

Bobby, I was wondering about the OHC commentas well.
 
I don't get the comparison to the 340 at all.  They look similar?  So does a small block Chevy.  The only thing one could use from a 340 - or any LA block for that matter - on an early hemi is the carb.  I just don't get that comparison.
 
Who said that?
 
Snotty
 
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Steve

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« Reply #50 on: October 08, 2007, 03:48:55 PM »

That was pretty slick huh?
 
After I wrote that I doubted myself and had to go look again.  The New Hemi is in fact NOT OHC.  I should spend more time being careful when looking at that stuff.  I confused it with the 6, which IS OHC.  
 
Now you Gizze. . . .  Sheeesh 
 
OK I yeeped up and Stitches is the first one to catch it.  Maybe it's too new for my brain to absorb. . .
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Mike

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« Reply #51 on: October 09, 2007, 02:29:03 PM »

Its alright Steve, Reading through the great post and contributions
that everyone has left another question popped into my Starchy brain.
The question being where does the LA engine originate and why is it
called and LA engine?

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Snotty

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« Reply #52 on: October 10, 2007, 09:31:29 PM »

Tater, the LA motor originated in '64 with the introduction of the 273 small block.  That block was bored to 318 c.i.d. in '67, then 340 in '68, and finally 360 in '72.
 
It's called "LA" to diferentiate it from the original "A" 318 that was phased out in '66.  This is not written in any Chrysler History, but I always think of "LAter A" becasue it came after the A.
 
The Big blocks introduced in '58 were either B or RB.  The RB meant "raised B" because its deck was one inch higher than the B.  The result is a wider motor - the 413/440 is 2" wider at the heads than the 383. 
 
BUT!!!!  Be careful, the '59-'60 383 is an RB!  Tricksy!!
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Mike

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« Reply #53 on: October 12, 2007, 02:43:35 PM »

Thanks a lot for clearing that up Scott, thats somthing I have wondered
about for some time, this post just keeps getting better.

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Ken

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« Reply #54 on: October 17, 2007, 05:01:48 PM »

What Snotty forgot to mention is that the FIRST B engine displaced 350 CI...a one year only item, as it was bored out to displace 361ci, then again for 383.

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Snotty

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« Reply #55 on: October 22, 2007, 09:18:31 PM »

Absolutely right, Moe.  But another fact - it was available in Plymouth only!
 
Chrysler's 350 is a trivia question I like to toss out at people.  (Did they make one?)  I do the same with these questions: 
Did Chevy ever build a 302? 
What's the difference between a Chevy 400 and a Chevy 400? 
If Chrysler's 350 and Chevy's 348 are both big blocks, how come a Pontiac 455 and an AMC 401 are not? 
Which Chrysler motor had the largest pistons? 
WHy does a Ford 427 have more horsepower than a Ford 428? 
WHy won't headers for a Chevy 350 fit on a Pontiac 350? 
Why is a Chrysler 318 physically larger than a Chevy 350?  Same question for a Chrysler 350 and an AMC 401?
 
I'm weird, but I like this kind of stuff!
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Mike

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« Reply #56 on: October 22, 2007, 09:34:24 PM »

Well Scott for one I believe I have an answer for you. Now back in the
60 and early 70's when GM was swinging in money each of the divisions
of GM Pontiac, Buick Olds and Chevy where independant divisions of each
other in regards to engineering. The blocks may have essentailly been
the same but each engine was set up different in terms of tuning and
ultimate HP output. A good example would be the 455 block thay Olds,
Pontiac and Buick used each was tuned and set up differently to put out
thier own respective HP therefor things such as headers would fit
different between the independant divisions.

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Snotty

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« Reply #57 on: October 23, 2007, 10:23:39 AM »

Swing and a miss!
 

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James Brown Jr,

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« Reply #58 on: October 23, 2007, 10:27:19 AM »

i always thought that the Buick, Olds, and Pontiac were all differant motors??
kinda like Arethe Caddy 502 and the GM BB502 the same motor??
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Snotty

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« Reply #59 on: October 23, 2007, 10:32:17 AM »

Bingo!  Albeit they were the same c.i.d., they were entirely different motors.  Therefore, headers for a Chevy 360 would not fit on a Buick 350, etc.  My former Brother-in-law discovered that on his '71 Skylark 350. 
 
Now, your question: the Caddy 502 was a Caddy motor only.  So, if you mean a "Crate GM 502," I would say that was a stroked 454 or other motor and not the same.
 
Do I win?
 
 
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