I just removed the heads from the 350 that used to be in my firebird before I installed the 455. I found .030 over pistons that were .025 in the hole, 4cc valve reliefs and 93cc heads. I measured the cam at 205/215 at .050, probably the same cam as the 2157. This cam in a 7.6:1 350 with stock converter and 2.73 gears is very docile. Not the right cam for a high compression 400.
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