i have 7H1 heads on a pontiac 400 engine these heads are from a pontiac 350 a 1972 lamans........what are the compression on these head....i had them shaved some at the local machine shop....nothing to radical.

Large chamber, just a guess, but about 8.8:1. One must actually measure the chambers to be certain. 350s of that era were 7.7:1, and rather anemic...

Jim

yea thanks .........