csstrux

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)

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

joe_padavano

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

Warhead

68CC!

J-(Chicago)

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

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

Norm

380 Racer

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

gmrocket

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