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Message: [QUOTE="Rich Rohrich, post: 1299416, member: 16241"] Rob - Wiseco uses one size for all, and the expectation is the bore will be finish honed to the correct piston to wall clearance. Eric hones his cylinders himself after they are plated to make sure they will be sized for the standard Wiseco piston clearance. The lettered piston sizes is to account for manufacturing variances at the OEM level. New barrels are measured and if they fall within a certain range they are marked to ensure that a matching piston ends up in an engine and the correct clearance is obtained. [/QUOTE]