Perf. Piston Ring Set V8 4.140 Bore 1.5x1.5x3.0

The Perf. Piston Ring Set V8 4.140 Bore 1.5x1.5x3.0 from NPR PISTON RINGS is engineered for high-performance V8 engines where precision ring fitment directly impacts compression, blow-by control, and long-term durability. Whether you're rebuilding a stroker motor, refreshing a vintage big-block, or upgrading an existing engine platform, this ring set delivers the critical seal needed to maximize combustion efficiency and oil control. Modern performance builds demand rings that maintain tight tolerances under sustained high RPM and elevated boost conditions—this set meets those exacting standards.

NPR's 1.5mm top ring, 1.5mm second ring, and 3.0mm oil ring configuration is a proven geometry for naturally aspirated and moderately boosted applications, balancing ring flutter resistance with flexibility at low temperatures. The 4.140-inch bore sizing ensures a perfect fit for commonly bored 350, 383, 406, and 427 small-block platforms, as well as select big-block engines in that displacement range. Precision-manufactured from high-grade cast iron with modern face coatings, these rings minimize friction while maintaining superior sealing and preventing excessive wear on cylinder walls—critical factors in engines subjected to track duty or extended high-load operation.

Mechanics and engine builders trust NPR ring sets for both stock restorations and performance rebuilds where OEM specifications must be matched precisely. Installation requires proper ring end-gap checking and careful piston preparation to avoid damage during assembly. These rings are compatible with standard reciprocating engines using 4.140-inch bore pistons and will perform reliably across cruise, street strip, and weekend racing applications. For any V8 platform requiring this specific bore diameter, the Perf. Piston Ring Set V8 4.140 Bore delivers the compression sealing and oil control that separates a mediocre build from one that runs strong for years.