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There are the same imprint on the piston, no big deal, I have another short block with domed pistons waiting to go in.
I removed the heads to do a little port clean up on them so the new motor will be complete and ready to go.
I'm surprised that the screw got sucked into the combustion chamber and THEN got out, without damaging either valve. Or, maybe, it got imbedded in the piston.