True the iron filings aside, as all bearing won't hold up to that, my understanding is Clevite makes different grades of bearings for the usual SBC/BBC, Hemi, Ford, etc from standard to high performance unless the application is AMC then we only have one option standard grade.

And according to Ken Parkman he had a chat with a Clevite tech who told him Clevite does not recommend their bearings in a high performance- high horsepower application.

King bearings where considered years ago the bargain basement, bottom line cheap replacement not to be considered for a high performance application. Today I don't know.

ACL bearings I wouldn't even consider for this application because a full groove bearing has half the ability to carry a load. They won't work at over 900 ft lbs of torque.

All bearings have a copper backing it's the coating that makes the difference.
In my engine the coating all showed high loading, (aside from the contamination) and inspection by a ball mic showed a average .0002 squish.

For MC the crankshaft has a .006 thousanths endplay.


Jeff