Main & Rod Bearings w/ Piston Rings 99-16 for CHEVY for GM LS Gen III IV 4.8L 5.3L MS2199 CB-663 E-937K 2M4978. Type: Piston Ring & Main & rod bearings. For GM CAR 325/5.3L OHY 8 16V"C" GM 3.780" Bore, 05-09 Premium.1.5 / 1.5 /3.0mm.