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Message: [QUOTE="76GMC1500, post: 1188035, member: 73139"] I would think an overheating would have more of the scuffing towards the top of the piston, in the area around the rings. It really does look like lack of lubrication to me. How does the underside of the crown look, any discoloration? Here is a shot of the underside of a crown that has been running hot. You can actually see the location of the spark plug in the center of the crown and you can see that the exhaust side of the piston was too hot. [IMG]http://i24.photobucket.com/albums/c8/76GMC1500/DSCF1916.jpg[/IMG] [/QUOTE]