Around 14cc or so,give or take depending on who's answering the question,some wil say more,others say less,but that's a good ballpark number to use for the valve relief CC's,especially seeing as those are the ones with the large chamfer around the circ. of the piston.
What you also have to account for is the fact that they also typically sit down in the hole like .030" or more (which is a BUNCH!) as that too kills the CR.
IMO those are the worst pistons ever available for a pontiac,whoever thought up that bright idea needs to be kicked in the nuts hard.
HTH
Bret P.
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