When building an engine and cylinder boring is necessary ... say the cylinders must be bored .060" over ... and you buy .060" pistons and rings ... which one is really .060" over? It can't be both. I know it is the norm to take cylinders and pistons to a machine shop and have the cylinders bored to be just right for the pistons. But what is it, though? Are pistons usually right at .060" and do the cylinders have to be bored a hair bigger for proper fit? Or are the pistons usually just a hair smaller to cause a near exact .060" overbore?