Wallace racing site lists a 400 cid with 6x heads @ 7.6:1 with stock pistons; not sure if they were beveled on the edge:
1975 400 185 HP Y9 A 7.6 255 6X 1-2 7045167 Block Casting # 481988/late 500557?
My 1971 GTO had the ys400 with 96cc heads listed @ 8.2:1 , and i suppose it was 250HP. It Ran pretty good.
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