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Do you send the pistons with jugs when they get bored, or just the jugs?
Ask who ever is boring the cylinders that question. The only pistons we don't request when boring are the SE Cast Pistons. We find them to be extremely consistant, all others we prefer to have the pistons along with the cylinders.
Each cylinder should be bored for it's respective piston. So, yes, if the shop you are using does not do it that way, find one that does. It does make a difference.