Formula to shave pistons to reduce compression ??

Brooks James said

Thanks guys flat top srp. Pics Friday. What would it cost to shave them and valve reliefs.
I don’t want to run hi cr with nitrous.

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Probably $200-$300. Aftermarket pistons have pretty deep valve reliefs and thick tops so I'm guessing it could be just milling and you're good to go with no valve relief work if you're going with a smaller cam for the 9to1 deal.