Are they domed pistons??? Don't look like it. My calculations with .037 compressed gasket, zero deck, and let's say 5cc valve relief area still only come to around 8.3:1 with a 3.75 stroke and 4.181 bore (If that is what the bore and stroke are). I'm not trying to be a jacka$$, just curious as to how you are arriving at those compression #'s with a 102cc head.
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Darin
'64 Bonneville Wagon (sold)
69 Lemans-All motor (sold)
9.81 @ 136.39MPH
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