wolf K One check before putting motor back togeather, check the endplay of the camshaft before installing front cover. I have a torrington bearing on my motor. Some guys just run shims. There is a spec, but a don't have it in front of me at this time. I also doubt that those shaving are not new. We all clean or motor pretty good. 1 peice of material or even 2-3 peices I can see. Not all the parts you had come out. Cut open the
oil filter and check inside there too for metal pieces. If you find none I would say motor is OK. IF you find a bunch, I would recheck all bearings, that material came from somewhere.
20K motor don't grow on trees either.
I have found that a second pair of eyes also helps. Good luck Rick L.