Revolutionary piston kits have modern racing pistons with low friction metric ring sets. Kits include lightweight forged ide relief (FSR) pistons, wrist pins with carbon steel wire locks, and JE Pro Seal premium piston ring set, complete with 1. 2mm premium steel top rings, 1. 5mm Napier second rings and 3. 0mm standard tension oil rings.Pit Stop USA offers SRP Professional Forged Flat-Top Piston & Ring Kit - SB Chevy - 4.030" Bore, 3.480" Stroke, 6.000" Rod 271056 at low everyday prices. Be sure to check out all of our products from SRP - Sportsman Racing Products including Sportsman Racing Products Forged Piston and Ring Kits and SRP Forged Piston and Ring Kits.