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I'll going to second and third what Track Rat has already stated. You have detonation until proven otherwise. Anyone who's run a boosted engine and gone lean will recognize this damage pattern. Obviously you're not boosted but detonation in a n/a motor will do the same thing. Yes, it will scuff your cylinder walls, break your pistons and ring lands as well as scuff your bearings as you are subjecting the cylinder to really high pressures (basically uncontrolled explosions). I've seen this enough times to say it's detonation as cause #1-#3 until proven otherwise.
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