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Other posts on this forum suggest Neo chamber volume is 51.5 cc. Webbersrbguide suggests between 50 and 53cc.

Anyway, without some data on the original pistons, assuming that those pistons are flat top and you have zero deck height at the block, and ignoring head gasket, it's just a matter of dividing 467.8 by 51.5 and getting 9.1:1 compression ratio. Which comes out as less than stock.

467.8 is (2498/6) + 51.5, in case you were wondering.

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So a -10cc piston with zero deck height and neo head 51.5cc will be better. 8 to 1 so allows room to deck the head and bring it up and run smaller head gasket thickness. I will be running 25psi boost with a gtx3582r. 1000cc injector with e85

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