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 Valve Spring Retainer Contains an antimicrobial agent to

Contains an antimicrobial agent to inhibit the growth of bacterial odors

Blue Fittings

Pontiac Motorsports Engineering

Larger diameters

ARP Thread chasers

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 Valve Spring Retainer Contains an antimicrobial agent toProduct 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