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Doesn't look like carbon to me... missing aluminum it is (!) Guess that particular piston would have been the next in line, to seize up....

Agreed, even if 3500 miles is not enough to consider this a good used motor... Reading post 1 again, it doesn't seem as if there was any sign of loss of power or cylinder(s) misfiring, shortly before the disaster. How could a faulty injector cause this much havoc in just seconds?

Can anyone explain this mark on the exhaust valve? A ½”-lockwasher would be about that size... But since this mark is so perfectly centered on the valve head and there are no evident signs on the corresponding piston, I doubt that the engine "ate" a washer... (?)