Originally Posted by Fastest65
But still how much should be taken off?
Listed as a .210" flat topped dome, rough estimate in my head from having done this before on other pistons and from comparisons to other 454 pistons and the dome size listed at each compression ratio tells me .090-.100" removed from the 2439F60 would be very close. Final amount cut dimension number would depend on how exact you want to be on the ratio and the exact measured cc of a chamber in your actual head as they will always vary some from the published spec because of the nature of casting tolerances back then. The head chamber could be smaller than listed but the usual pattern is they are bigger than listed.