New motor, loose rocker...

You will want to actually cut that filter open, the racers do it all the time to check their engines. I usually drill a 3/8" hole down 1" from the thread base on the filter (or punch a hole in it with a scratch awl and open that up to 3/8" with another punch so as to not get loose filings into the filter), then take one of these 3 legged Air Sheers and put the center finger of it into the 3/8" hole and zip around the filter quick.

Can do the same thing with and Air Hammer and the 3 fingered Body Panel cutter bit, zip around it till the can falls off.

This is the area that will actually be catching all of the nasty debris, take a magnet to that paper filter, this will tell you the whole story, and see what pours out of the tin can part of the filter too.

Most of that black residue in the pan is probably the cast iron from the cylinder walls from the rings breaking in. You can take a magnet and swish it around in the bottom of the drain oil pan of the oil you just drained out and see what you pick up there too.

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Yep , this right here, the power tool he is speaking of is called Nibblers , this could save a lot labor and parts ,{possibly }