Pistons specs question for 340 build

33IMP said

DIRECT quote from Wallace racing compression ratio calculator:
Input a positive number for valve reliefs.
Input a negative number if it has a dome.
Maybe we can agree that following instructions for the particular ratio calculator you use is a good idea?

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Evidently they calculate it backwards. Go to the UEM site and use theirs. I'll wait right here. Did you read the Summit link? It's not standard across the board.

I don't have a dog in the hunt other than to say MAKE DAMN SURE your math is right, because since the methods are not standardized, it's easy to make a mistake.