That was my reason for starting this thread. Whats the deal? Do I really have to use dished pistons with my 670 heads. I was at a car show Friday and talked to a couple of guys with 670 heads on their 67 GTO's like mine and they said they run great. I was reading Jim Hands book last night and he said the advertised 10-3/4:1 was an advertisement and that they where more like 10:1 maybe a touch higher. Did they not run great back then and my 428 put out 376hp. Why then with a bigger cam and my un ported 670's, headers, x-pipe,aluminum intake and 750 double pumper and bored .030 wont my motor run and put out 400-450hp? Some say 10.1:1 is optimum and others say 9:1.
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