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So, I haven't even started my examination yet today, but I thought the noise was near the cam when it was running at idle.  I thought that maybe the followers were a bad fit in the bores and were grinding away, but they seemed as smooth as butter when I looked last night. I had no metallic appearance in my oil, nor any metal on my drain plug magnet.  My oil filter has a big magnet inside it and I disassembled the filter and it had no metallic particles either, which is a good sign.

I have many things to check...  Things like keyways, sloppy bushings, and contact surfaces are all on the list. As Nigel said, I know for sure that I have a "busted wallet"...