Perf. Piston Ring Set V8 4.130 Bore 1.2x1.2x3.0

The Perf. Piston Ring Set V8 4.130 Bore 1.2x1.2x3.0 from NPR Piston Rings is engineered for serious engine builders and performance mechanics who demand precision-fit compression and oil control in high-displacement V8 applications. This ring set is purpose-built for large-bore stroker and modified engines where OEM rings fall short of performance demands. Whether you're building a street engine, bracket racer, or high-horsepower truck platform, premium piston rings are critical to seal cylinder pressure, reduce blow-by, and maximize power output while protecting against premature ring wear and scoring.

The 4.130-inch bore specification accommodates oversized pistons common in bored-and-stroked V8 builds, while the 1.2x1.2x3.0 ring package (top, second, and oil ring thicknesses) delivers optimal balance between sealing efficiency and reciprocating mass. NPR's performance-grade materials resist thermal cycling and detonation better than stock rings, maintaining tight piston-to-wall clearances even under sustained high boost or nitrous oxide applications. The precisely machined gap, profile geometry, and tension characteristics ensure consistent oil consumption, reduced friction losses, and extended ring and cylinder wall life—critical factors in engines routinely exceeding 400+ horsepower.

This ring set is ideal for mechanics and engine builders installing custom pistons in big-block Chevrolet, Ford, or Mopar V8s, as well as fuel-injected or carbureted performance builds demanding reliability under extreme conditions. Proper installation requires careful ring gap filing to your specific bore finish, verified piston clearance, and use of a ring compressor during assembly. Always cross-reference your piston manufacturer's recommendations and ensure cylinder bore finish (RMS 20–40) meets NPR specifications for optimal sealing and ring life. Sold as a complete set for one engine.