NPR American V8 Engine Ring Series Piston Ring Set - 4.040 in Bore - 1.5 x 1.5 x 3.0 mm Thick - Standard Tension - Nitride - 8-Cylinder 12591689 stiffness and MOI optimization for

stiffness and MOI optimization for drag and circle track applications

Kits fit stock spindles

1972-1973 Pontiac LeMans CID 455

if a lighter load increases the motor speed by 25%

These numbers far exceed any DOT or SAE specifications

NPR American V8 Engine Ring Series Piston Ring Set - 4.040 in Bore - 1.5 x 1.5 x 3.0 mm Thick - Standard Tension - Nitride - 8-Cylinder 12591689 stiffness and MOI optimization forProduct Description: Piston Rings American V8 Engine Ring Series 4. 040 in Bore 1. 5 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