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NPR American V8 Engine Ring Series Piston Ring Set - 4.140 in Bore - 1.2 x 1.2 x 3.0 mm Thick - Standard Tension - Nitride - 8-Cylinder Scat Enterprises com features Nitrous Oxide SystemsProduct Description: Piston Rings American V8 Engine Ring Series 4. 140 in Bore 1. 2 x 1. 2 x 3. 0 mm Thick Standard Tension Steel Nitride 8 Cylinder NPR Piston Rings is a world leader in the production of piston rings. A long time supplier for OEM applications, they also produce a line of performance piston rings designed for top tier performance and reliability. With performance piston rings for a wide range of engines, including popular V8's from