Formula to shave pistons to reduce compression ??

Rdrd to determine how deep it is

JBurch said

It still might not be a bad idea to buy 4 pistons......that would give you 3 spares to fix tuning snafu's, people who build nitrous motors buy extra pistons to see how deepreplace the ones . Plusthat get scorched, it's an idea

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I wasn’t able to negotiate the price down , enough plus the guy has other guys willing to , take it as is without sonic testing. Plus there is a gouge in the wall and it’s hard to determine how deep it is , Too many unknowns, ifs, then, but, maybe etc