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I would have to guess cam bearings also. seem too small for crank bearings and rocker arm bearings would have a hell of a time getting into the oil pan
Its definitely not a crank, rod or cam bearing. I was also thinking a trunion bearing but wanted a more clear picture to be safe. That last picture looks like a valve seal band broke but its too big I think..
And BTW. Its VERY easy for anything that comes from the top of the head to end up in the pan. Unless it gets caught up in a small valley, it only has one place to go, and that's down.
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Hard to tell, piece is blurry. 
Found THIS in the oil pan 
