if you are saying the bore are tapper from top to bottom less than a 1/2 a thou 5 tens that is good if there are size are diffrent that may be from the size of pistons i have seen pistons in the same set 001.3 smaller or bigger i fit every piston to the bore if they are like this it happens . if was TQ plated that will move the top of the bores you want to have the main caps tq down to when checking bores////// 6.135 rods stock