NPR American V8 Engine Ring Series Piston Rings - 4.030 in Bore - 1.5 x 1.5 x 3.0 mm Thick - Standard Tension - Nitride - 8-Cylinder 21001-27333-WL ApprovedDoes not require an MSD

ApprovedDoes not require an MSD Ignition ControlMechanical advance assembly can be locked out for crank trigger systemsPolished steel shaft is QPQ coated and guided by a sealed ball bearingMaintenance-free magnetic pickup and precision reluctor create stable trigger signals throughout the rpm rangeVacuum advance canister for improved economy (can be locked out)Easy-to-adjust mechanical advance with supplied springs and stop bushingsPowerful built-in module produces a 7

Gold Anodize

1964-1972 Oldsmobile Cutlass

Note: Spacer Kit #MOR63510 converts the #MOR63500 pump to the '69-later "long" design

Endura Corrosion Resistant Finish

NPR American V8 Engine Ring Series Piston Rings - 4.030 in Bore - 1.5 x 1.5 x 3.0 mm Thick - Standard Tension - Nitride - 8-Cylinder 21001-27333-WL ApprovedDoes not require an MSDProduct Description: Piston Rings American V8 Engine Ring Series 4. 030 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