Boring and honing late model engines isn't exactly a boring subject. If not done right, you can end up with bores that are not round and straight, piston rings that don't seal very well, increased blow by and ring wear, and a very unhappy customer. One of the goals of boring and honing cylinders is to size the bores to a specific dimension. If an engine is being remanufactured to meet specific criteria, that usually means boring and honing to achieve a standard oversize (.010", .020" or .030"). The oversize will depend on the thickness of the casting, how much boring it can safely handle without the cylinder walls getting too thin, and the amount of wear in the cylinders.
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