NPR American V8 Engine Ring Series Piston Ring Set - 3.937 in Bore - 1.2 x 1.5 x 3.0 mm Thick - Standard Tension - Nitride - 8-Cylinder COM34-236-4 Important For Headers

Important For Headers

Provides 3500 to 3800 Stall behind Small Blocks and 3800 to 4000 Stall behind Big Blocks

And because they retain the factory wheel base

Premium stainless steel T-bolt clamps and a urethane hump coupling are used for strength and durability while also providing the most secure installation available

short water pump and crankshaft pulleys are made of aluminum billet and available with single or double grooves

NPR American V8 Engine Ring Series Piston Ring Set - 3.937 in Bore - 1.2 x 1.5 x 3.0 mm Thick - Standard Tension - Nitride - 8-Cylinder COM34-236-4 Important For HeadersProduct Description: Piston Rings American V8 Engine Ring Series 3. 937 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