I dropped a valve in a 327 once. Buried in the piston. Barely marked the head.
LOL… this hemi was in a drag boat that blew up just as it launched,a good portion of it is at the bottom of the lake. It blew several rods out the side of the block and the blower only stayed on because it was tethered in place.
I was able to grab the piston as the engine was being salvaged for any useable parts that were left. The left head was broken into at least 3 pieces.
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