i didn't try to verify your actual numbers, but it looks like you forgot to add in the volume of the piston dish, which is 10.10cc for the P28s - you would need to add 10.10 to both the total swept volume and compressed volumes - taking the .015 off the head gasket thickness is close enough, since these are approximate numbers anyway - not sure what your deck clearance number is for - the Z6 has zero piston to deck clearance and after you mill the block, the pistons actually project above the top of the block
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