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From 1977 to 1987 I was outside salesman for an auto parts jobber with a machine shop. We sold parts for all types of engines. At that time an engine overhaul usually consisted of a valve job, and replacing rings and bearings. Perfect Circle sold iron or chrome piston rings. Ring wear is often measured by the gap between the ends of the ring. The bore should be clean and round top to bottom. Since the condition of an engine will vary based on use it use, is important to take measurements. I recommend getting a good shop manual for the vehicle. I tend to use Haynes manuals whenever I buy a vehicle. The manual will tell you the acceptable tolerances and step you through the procedures. Keep track of mating parts.
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