Perf. Piston Ring Set V8 4.165 Bore 1.2x1.2x3.0

The Perf. Piston Ring Set V8 4.165 Bore 1.2x1.2x3.0 from NPR PISTON RINGS is designed for high-performance V8 engines that require precise ring geometry and superior sealing integrity. These rings are crucial for restoring compression, controlling blow-by, and maximizing combustion efficiency in both street and racing applications. Whether you're rebuilding an engine or upgrading an existing one, this ring set provides the dimensional accuracy and material quality that distinguishes professional-grade components from mass-market alternatives.

This piston ring set features a three-piece design with a 1.2mm top ring, 1.2mm second ring, and 3.0mm oil control ring—a proven configuration that balances gas sealing with oil management across the piston stroke. The 4.165-inch bore specification ensures a proper fit in late-model V8 platforms while maintaining the tight tolerances critical to ring-to-groove clearance and bore contact pressure. NPR's manufacturing process produces rings with consistent face profiles, proper gap clearance, and optimized spring tension, which reduces friction losses and prevents ring flutter and excessive blow-by at high RPM.

Serious engine builders and machine shops rely on NPR rings for complete rebuilds, performance overbores, and competition engines where OEM components may not suffice. Installation requires careful bore honing to achieve the proper surface finish and accurate piston-to-wall clearance to avoid ring binding. This piston ring set is an excellent choice for anyone looking to enhance engine performance and reliability.