Connecting Rod Color?

A local engine builder told me that the copper coating was put on rods by mopar on the rods that the bearing tolerances were a little to sloppy, to take up .001-.002. Not sure if that is a fact or not but that is what i was told. He told me to stay away from them becauce the coating wears off after a while. I had 2 in one of my 360s. I wasnt sure, so i replaced them. Probably would have been fine for all i know.