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  #1  
Old Mar 5th, 09, 03:56 PM
machi machi is offline

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Default gm cylinder head cc sizes

every thing i look up for the many different heads i got dont tell me cc size of the stock heads, ive also been told that the 2.02 heads with id # 3917291 are "turbo" heads ,not sure what they ment by this?? can any one help??
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  #2  
Old Mar 5th, 09, 04:07 PM
pdq67 pdq67 is offline
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Default Re: gm cylinder head cc sizes

Try here even tho it's not complete!

http://www.chevytech.com/

pdq67
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  #3  
Old Mar 5th, 09, 04:27 PM
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Vintage 68 Vintage 68 is offline
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Quote:
Originally Posted by machi View Post
... also been told that the 2.02 heads with id # 3917291 are "turbo" heads ,not sure what they ment by this?? ... ??
They mean you should be impressed an pay them Big $$$ for them
That, or they don't know $tuff about Chevy heads
There is no such thing as a '291 "Turbo Head" - these will not fit Corvairs, the only car manufactured by GM with a turbo that year...
The '291 is a 1968 (year model) casting only. Corvairs used "Turbo" mufflers, carbs, pistons and lots of other "turbo" parts
It looks nearly identical to the '461-462 castings used the year before, but it has a flat boss on the side between the single left exhaust port and the center two ports. This boss is drilled and tapped for a Temp. Sender on the 1968 models (moved down from the intake manifold).
The chamber CC is usually in the 63~65cc range from the factory - but they can vary a bit more on some and it is also normal to find them smaller now as many heads you'll find have been 'milled' over the years reducing them.

These are commonly called "Camel Hump" heads
This refers to the two 'humps' on the front pad of the head...

These came in both 1.94" and 2.02" intake valve size.
The 'factory' heads have a "fly-cut" relief machined around the chamber intake valve area to unshroud the valve.

Here is a quick 'cheater' list of common head CC and valve size(s):
(cast # - CC - Intake - Exhaust)
032 70cc 1.72 1.50
034 64cc 2.02 1.60
041 63cc 1.94 1.50
041 64cc 2.02 1.60
049 55cc 2.02 1.60
056 56cc 1.72 1.50
064 67cc 1.72 1.50
113 58cc 1.94 1.50
116 60cc 1.72 1.50
185 70cc 1.72 1.50
186 63cc 1.94 1.50
186 63cc 2.02 1.60
187 64cc 2.02 1.60
188 75cc 1.72 1.50
291-1 63cc 1.94 1.50
291-2 64cc 2.02 1.60
293 75cc 1.72 1.50
306 56cc 1.72 1.50
316 76cc 2.02 1.60
339 75cc 1.72 1.50
414 64cc 2.02 1.60
441 76cc 1.94 1.50
460 69cc 1.72 1.50
461 62cc 2.02 1.60
461x 62cc 1.94 1.50
462 62cc 1.94 1.50
462 63cc 2.02 1.60
465 60cc 1.72 1.50
480 69cc 1.72 1.50
482 75cc 1.72 1.50
487 75cc 1.94 1.50
487x 75cc 2.02 1.60
492 64cc 2.02 1.60
493 76cc 1.94 1.60
520 61cc 1.72 1.50
523 67cc 1.72 1.50
537 69cc 1.72 1.50
539 60cc 1.72 1.50
545 76cc 2.02 1.60
549 69cc 1.72 1.50
550 60cc 1.72 1.50
554 70cc 1.72 1.50
598 76cc 1.94 1.60
624 76cc 2.02 1.60
682 69cc 1.72 1.50
684 75cc 1.72 1.50
692 60cc 1.72 1.50
754 60cc 1.72 1.50
762 56cc 1.72 1.50
770 60cc 1.72 1.50
772 69cc 1.72 1.50
775 75cc 1.72 1.50
881 76cc 2.02 1.60
882 75cc 1.94 1.50
896 60cc 1.72 1.50
916 76cc 2.02 1.60
991 75cc 1.72 1.50
993 75cc 1.94 1.50
993 75cc 2.02 1.60
997 76cc 1.94 1.60


Hope this helps...
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  #4  
Old Mar 6th, 09, 07:01 AM
pdq67 pdq67 is offline
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Smile Re: gm cylinder head cc sizes

Fwiw, my virgin chambered big valve -461's cc'd at 66.0 and 66.+ cc's!!

And you forgot the -601's that can be as small as 52 cc's!

My -601's cc'd at 53 and 55.

And my old trough sparkplug chambered '56, 265, -306 heads chambers cc'd at 60 cc's and 118 to 120 cc intake port size!!

This is why the old 283 Power-Pack head was such a winner on a 283 b/c their intake ports are right at 137 cc's or so, way bigger than the earlier heads dinky ports!

pdq67
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  #5  
Old Mar 6th, 09, 11:24 AM
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Vintage 68 Vintage 68 is offline
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Talking Re: gm cylinder head cc sizes

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Originally Posted by pdq67 View Post
... And you forgot the -601's that can be as small as 52 cc's!

pdq67
I left a bunch of them off the pocket list Paul, because I'm seldom interested in them if I see them at swaps and etc...
You'll notice loads of the 'light-weights', like the '883, aren't on there either - they are just to junky/iffy to even consider buying

Feel free to edit the list with your favorites
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1968 Convertible
Some trucks
Other V8 things - some of which float
Other V6 things - none of which float
Oh yeah, and 1 "Straight-Six" ...

If a man says something in the garage - and his wife can't hear him - is he still wrong !!!
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  #6  
Old Mar 6th, 09, 03:13 PM
pdq67 pdq67 is offline
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Default Re: gm cylinder head cc sizes

No, not at all, the -601's are to me, dandy lightweight casting heads for little engines!

pdq67
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  #7  
Old Mar 8th, 09, 09:55 AM
OAKLYSS OAKLYSS is offline
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Default Re: gm cylinder head cc sizes

Yes youngsters, there is a "Turbo" head for SBC. An over the counter only part. Part # 3965784, casting number 340292. Developed in 1975, the best SBC head of the era. "Turbo" is the nickname, like "Powerpack" or "Fuelie" is. They have 14mm angle plugs, 2.02, 1.60 valve seats, no heat riser, large ports, 66cc chambers, screw in studs, new design inlet port floor, large valve spring pockets, Tin alloy added. I have owned a couple pairs before.
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Last edited by OAKLYSS; Mar 8th, 09 at 03:36 PM.
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  #8  
Old Mar 8th, 09, 11:11 AM
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Default Re: gm cylinder head cc sizes

Quote:
Originally Posted by OAKLYSS View Post
Yes youngsters, there is a "Turbo" head for SBC. An over the counter only part. Part # 3965784, casting number 340292. Developed in 1975, the best SBC head of the era. "Turbo" is the nickname, like "Powerpack" or "Fuelie" is. They have 14mm angle plugs, 2.02, 1.94 valve seats, no heat riser, large ports, 66cc chambers, screw in studs, new design inlet port floor, large valve spring pockets, Tin alloy added. I have owned a couple pairs before.
They are angle plug also?
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  #9  
Old Mar 8th, 09, 12:54 PM
OAKLYSS OAKLYSS is offline
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Default Re: gm cylinder head cc sizes

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Originally Posted by 67 Plum View Post
They are angle plug also?
Yes, that is what I said. These were Chevys top racing heads until the Bowtie line came out.
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  #10  
Old Mar 9th, 09, 12:44 PM
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Vintage 68 Vintage 68 is offline
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Unhappy Re: gm cylinder head cc sizes

Quote:
Originally Posted by OAKLYSS View Post
Yes youngsters, there is a "Turbo" head for SBC. An over the counter only part. Part # 3965784, casting number 340292...
Gee, then why don't we just throw Low Port, Mirror Port, "Canuk's", R.Flow, 9C1's, GTZ's, SB2.2's, and maybe even them "Roll-Overs" names at him also
That will really help answer the question he asked...

He asked a question about a single head number 3917291.

His question was;
Quote:
Originally Posted by machi View Post
... ive also been told that the 2.02 heads with id # 3917291 are "turbo" heads ,not sure what they ment by this?? can any one help??
I answered THAT question;
Quote:
Originally Posted by Vintage 68 View Post
... There is no such thing as a '291 "Turbo Head" - these will not fit Corvairs, the only car manufactured by GM with a turbo that year...
The '291 is a 1968 (year model) casting only...

Hope this helps...
I didn't try to 'confuse the issue with facts' about what some other GM heads are refered to - by some.
Specially some of the low-production "over-the-counter" units sold only for a few years...
I highly doubt that one GM/MTG employee's in the 70's would ever refer to those heads by that name anyway - none I ever talked to did when they were supplying me with them
Oh, btw - only the post 1976 production '292's have the higher 'tin' alloy content (this helped with the head gasket failures by strengthening the deck section), the earlier versions don't
You also forgot to mention the need for different head bolt lengths at some locations vs. standard heads - but, folks that build performance engines would know this...

Quote:
Originally Posted by OAKLYSS View Post
These were Chevys top racing heads until the Bowtie line came out.
Most folks building performance engines using GM heads still prefered the earlier '746' 'Raised Plug' head for high compression engines - prefering the stronger deck over smoother port flow (unported) for engine longevity.


My wife did get a kick out of the "youngsters" comment though
She told me "don't let it go to your head" though
__________________
1968 Convertible
Some trucks
Other V8 things - some of which float
Other V6 things - none of which float
Oh yeah, and 1 "Straight-Six" ...

If a man says something in the garage - and his wife can't hear him - is he still wrong !!!

Last edited by Vintage 68; Mar 9th, 09 at 01:00 PM. Reason: spellin'
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