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Not positive on the piston cracking, but on 4 stroke, 2 valve, air cooled, motorcycle engines; their is a phenomenon known to cause cracking between the intake and exhaust valves. The way Kevin Cameron (cycle world editor) explained it, was that the repeated heating and cooling if the...

If any aluminum got past the exhaust valve, it pretty much has to go through the Turbo. I would definitely check the blades for damage.