NPR American V8 Engine Ring Series Piston Ring Set - 3.937 in Bore - 1.2 x 1.2 x 3.0 mm Thick - Standard Tension - Nitride - 8-Cylinder ST6 FN Carbon ZERO Contain Spherical Bearing Mount

Contain Spherical Bearing Mount

This works well for stock trucks but for heavy duty use and higher horsepower applications this may be insufficient

1-3/16 in Caps

5 psi Preset

Holley recommends part numbers 12-1200-2 or 12-1600-2 for optimum hot fuel handling

NPR American V8 Engine Ring Series Piston Ring Set - 3.937 in Bore - 1.2 x 1.2 x 3.0 mm Thick - Standard Tension - Nitride - 8-Cylinder ST6 FN Carbon ZERO Contain Spherical Bearing MountProduct Description: Piston Rings American V8 Engine Ring Series 3. 937 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