For perspective on piston slap... I recently had the cylinder heads off of a 1995 3.0 Ford with 150,000 miles on it. There were NO ridges at the cylinder tops, and the factory hone x-hatching was clearly visible throughout. Basically, the engine internals looked like new after 15 years and 150,000 miles, but the body is becoming a rotted out P.O.S....
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