head ccsize

csstrux · April 26th, 2009, 05:22 PM

From a prior thread the combustion chamber was said to be 68cc vs the stated 64 on #5 heads according to norm. I believe I have read the same info in a technical publication as well, and was surprised to see it in wiki. I have not confirmed this myself and the thread went off on a machining tangent, but thought this worth note to the powers that be.

J-(Chicago) · April 27th, 2009, 01:26 AM

Just a contribution here.
My G heads cc'd at 79
and the Ga's were 80cc

joe_padavano · April 27th, 2009, 08:03 AM

Quote:

Originally Posted by J-(Chicago)

Just a contribution here.
My G heads cc'd at 79
and the Ga's were 80cc

But do you know for a fact that they were virgin?

Warhead · June 15th, 2009, 11:47 AM

68CC!

J-(Chicago) · June 15th, 2009, 02:05 PM

Quote:

Originally Posted by joe_padavano

But do you know for a fact that they were virgin?

I'm afraid not.
I was born in 82'

I bought the car in 1999 and it had the stock steel shim head gaskets.

88 coupe · June 17th, 2009, 06:48 AM

Quote:

Originally Posted by J-(Chicago)

........ My G heads cc'd at 79
and the Ga's were 80cc

There is no reason to believe these numbers are not accurate.

Norm

380 Racer · June 21st, 2009, 05:40 AM

The #6s that came off my original motor were 69ccs. The #7s were 70ccs. I'm sure they were virgins also.

gmrocket · October 21st, 2009, 09:15 PM

measuring the head thickness will tell you if they have been cut. dont forget these are castings&the cc's can be quite different from one same head to another ,,in fact even the same head can be different by a cc or more form the chamber at one end to the chamber at the opposite end.

i just cut some 307 5A's that were way differennt..one head needed .018 more cut than the other to get the same cc'c

April 26th, 2009, 05:22 PM	#1 (permalink)
csstrux Super Moderator Join Date: Sep 2007 Location: Janesville wisconsin Posts: 1,659	head ccsize From a prior thread the combustion chamber was said to be 68cc vs the stated 64 on #5 heads according to norm. I believe I have read the same info in a technical publication as well, and was surprised to see it in wiki. I have not confirmed this myself and the thread went off on a machining tangent, but thought this worth note to the powers that be. __________________ Chad Greed: in psychology is an excessive desire to acquire or possess more than what one needs or deserves, especially with respect to material wealth

April 27th, 2009, 01:26 AM	#2 (permalink)
J-(Chicago) Seasoned beater pilot. Join Date: Jan 2007 Location: Chicago Posts: 2,696	Just a contribution here. My G heads cc'd at 79 and the Ga's were 80cc __________________ I'd rather have a numbers matching poker hand.

June 21st, 2009, 05:40 AM	#7 (permalink)
380 Racer Registered User Join Date: Aug 2008 Posts: 156	The #6s that came off my original motor were 69ccs. The #7s were 70ccs. I'm sure they were virgins also. __________________ A small block with a big block attitude! I have found that no matter how much I care, some people are just assholes

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June 15th, 2009, 11:47 AM	#4 (permalink)
Warhead Registered User Join Date: Mar 2008 Location: Phx, AZ Posts: 309	68CC!

October 21st, 2009, 09:15 PM	#8 (permalink)
gmrocket Membership Revoked by Admin Join Date: Nov 2008 Posts: 52	measuring the head thickness will tell you if they have been cut. dont forget these are castings&the cc's can be quite different from one same head to another ,,in fact even the same head can be different by a cc or more form the chamber at one end to the chamber at the opposite end. i just cut some 307 5A's that were way differennt..one head needed .018 more cut than the other to get the same cc'c