I have had a few 572's (4.50" x 4.50"). All with Diamond pistons. Two with 7.1" rods and .990 pins (2.20" rods). Neither had the pin in the oil ring. I had one for heavy nitrous once that had thicker domes and the rings moved down. It had the pin in the oil ring.
Hemi or RB? Hemi valve relief dictates lower ring pack.
