early 273 pistons.

perfacar said

I know that, was just stating what max CR can be, I'm not stupid!! usually average CR on those was 8.8 . back off.

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If you are talking to me, That reply was not for you. It was more for those that followed your post. Having cc'd, a number of heads, It was interesting to me that both J heads and 273 closed chambered heads took .040 to get to NHRA minimum cc's.