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when calculating the clearance volume and reaching for the piston dome volume wouldn't the dobbed piston volume be added to the clearance volume formula ?
I don't know what "dobbed" means, but anything above the level top of the piston, like a dome, is normally subracted from the chamber volume, because it's reducing it, and anything below is added, because it's making the chamber volume larger, examples being valve notches and bowls/depressions.