Quote:
Originally Posted by shaks 442 clone
can the compression be steped up on a 71 or newer engine by simply changing the heads and pistons?
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All Olds big block heads have the same 80-ish CC chambers (except for the 68-69 D heads that have a designed chamber of 72 CC). Note that as-cast the chambers tend to run about 83-84 CC. The compression ratio is varied by changing the size of the dish in the pistons. The factory low-compression pistons look like soup bowls.