NPR American V8 Engine Ring Series Piston Ring Set - 4.160 in Bore - 1.2 x 1.5 x 3.0 mm Thick - Standard Tension - Nitride - 8-Cylinder LUC10621-3 one for top end overrev

one for top end overrev protection and another to use during the burnout to achieve consistent tire temperatures

Vehicles with larger cooling systems should use two bottles

1958-1974 Chevrolet Impala

1968-1969 Plymouth GTX

NPR American V8 Engine Ring Series Piston Ring Set - 4.160 in Bore - 1.2 x 1.5 x 3.0 mm Thick - Standard Tension - Nitride - 8-Cylinder LUC10621-3 one for top end overrevProduct Description: Piston Rings American V8 Engine Ring Series 4. 160 in Bore 1. 2 x 1. 5 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