NPR American V8 Engine Ring Series Piston Ring Set - 4.060 in Bore - 1.2 x 1.2 x 3.0 mm Thick - Standard Tension - Nitride - 8-Cylinder 12-678-4 1/2 - 20 and metric

1/2 - 20 and metric M10-1

Four 2-1/16 in Holes

Penske Racing Shocks is a dominant shock supplier in the AMA Flat Track racing series

Ideal replacement for factory boost controllers

CNC Machined 6061 Aluminum Construction

NPR American V8 Engine Ring Series Piston Ring Set - 4.060 in Bore - 1.2 x 1.2 x 3.0 mm Thick - Standard Tension - Nitride - 8-Cylinder 12-678-4 1/2 - 20 and metricProduct Description: Piston Rings American V8 Engine Ring Series 4. 060 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