Quote:
Originally Posted by Dick Boneske
Neither one of those tables lists cc's correctly. The '64 GTO heads were specified to cc at 72. The actual chamber size on '64 GTO's from the factory was 74-76 cc. The 421 HO heads were identical in valve size and casting number, but were bigger chambers to achieve 10.75:1 compression. None of the '64 421HO or GTO heads were 68 cc stock.
|
I think the spec'd size of the 716 chambers was 68 cc's, but they typically measured 72. The 400 heads were spec'd at 72 cc's and typically measured 75 cc's.