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 engineered for high-performance V8 engines requiring precise ring geometry and superior sealing integrity. These rings are essential for restoring compression, controlling blow-by, and maximizing combustion efficiency in both street and racing applications. Whether you're rebuilding a tired long-block or upgrading an existing engine, this ring set delivers the dimensional accuracy and material quality that separates 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 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, reducing friction losses while preventing 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 fall short. Installation requires careful bore honing to achieve proper surface finish (typically 20–40 microinches Ra) and accurate piston-to-wall clearance to avoid ring binding or excessive blow-by. This ring set is compatible with standard V8 pistons featuring a 4.165-inch bore diameter; always verify ring end gaps and piston groove dimensions against your specific engine platform before assembly. Proper break-in procedure and quality oil control during initial operation are essential to achieving maximum ring life and seal quality.