Joe, I have a set of 1967, 428, 670 heads on a .030 over 400 with TRW forged flat top pistons 9.78cr. I use 93 unleaded gas with no problems. In my 65 GTO it runs 11.73 @ 117. The 400 heads are 72cc the 428 heads are 75cc.
Man, I'm pretty! WHOA MAMA!
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