Don't worry about it, I did a 470 C.I. motor (440 block, 3.91 stroke) bracket race high compression(12.8 to 1, not real high) race gasoline motor that made 720 HP at 7000 RPM, no sealing or noise problems on the dyno I did the same thing on the clearances, added .001 to the minimum To many people think of the Hyper pistons when you mention KB pistons, the forged sereis pistons are not like the hypers at all IHTHs