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Just went back to look at the video in slow motion. I believe there is a shinny spot showing up on the fly wheel. Might try rotating the engine with the bad boy breaker bar on the front damper bolt. Turning a quarter turn and lOOking very close at the motion rotation parts for HumV gremlins...

Shut it off and see if you can swab up a sample (rag, Q-tip on a stick) on the inside of the cover or look on the inside of the cover you removed for fresh fine metal filings. Might be a clue if you fine some. Exhaust heat shield is close by. Might be that? Does sound like something spinning...