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Message: <blockquote data-quote="poorthang" data-source="post: 488409" data-attributes="member: 31585">open that image in a new tab, then enlarge it. you see the results of detonation/lugging at the 6-8 oclock position. it broke away the top ring land and damaged the ring. my guess, based on one picture, would be too much load or over propped, as mr turbo stated. that kept the piston rocking until the land was damaged, then the oil comsumption and burning on the piston top occured. BLACK DEATH it is called. if i am right, replace the rod and related pin and bearing. and, remember, all the little specs of piston, and crystalised burned oil went directly into a running engine. while it is apart, i would tear the crank out and inspect it, and then the oil pump. if an aluminum bodied geroter oil pump, i would replace that too.</blockquote>