NPR American V8 Engine Ring Series Piston Ring Set - 4.145 in Bore - 1.2 x 1.2 x 3.0 mm Thick - Standard Tension - Nitride - 8-Cylinder 411997 Insulator configurations - Special configurations

Insulator configurations - Special configurations are used for the insulator noses to improve throttle response

giving drivers both a performance edge and a bold presence on track

Independant tests have demonstrated a typical 25 horsepower gain over the previous Pro1 design

12 AN O-Ring PCV Ports

Super 10 Muffler 409S - 2

NPR American V8 Engine Ring Series Piston Ring Set - 4.145 in Bore - 1.2 x 1.2 x 3.0 mm Thick - Standard Tension - Nitride - 8-Cylinder 411997 Insulator configurations - Special configurationsProduct Description: Piston Rings American V8 Engine Ring Series 4. 145 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