Perf. Piston Ring Set V8 4.165 Bore 1.5x1.5x3.0

The Perf. Piston Ring Set V8 4.165 Bore 1.5x1.5x3.0 is engineered for high-performance V8 engines requiring precision ring control and durability under sustained boost and high RPM conditions. Built by NPR Piston Rings, a trusted manufacturer in the performance engine market, this ring set addresses the critical need for proper compression sealing, oil control, and blow-by reduction in modified and stock powerplants alike. Whether you're rebuilding a naturally aspirated engine or upgrading a turbocharged platform, quality piston rings are non-negotiable for engine longevity and performance retention.

This ring set features a 1.5mm top ring, 1.5mm second ring, and 3.0mm oil control ring configuration—a proven geometry for balancing gas sealing efficiency with minimal friction losses. The 4.165-inch bore diameter matches common V8 stroke combinations used in both classic and modern performance builds, including popular overbore applications. NPR's manufacturing tolerances ensure consistent gap closure across the power stroke, reducing combustion leakage and maintaining cylinder pressure integrity during acceleration and cruise. The stacked ring design minimizes flutter and chattering, critical factors when running elevated boost levels or extended high-load scenarios on modified engines.

Engine builders, performance shops, and serious enthusiasts rebuilding 4.165-bore V8 blocks will find this ring set essential for any bottom-end refresh targeting reliability and power retention. Installation requires proper honing to specification and careful gap setting per manufacturer guidelines to ensure optimal sealing without ring bind. This product is compatible with standard V8 piston packages in the 4.165-bore family and suits applications ranging from street engines to competition platforms. Pair these rings with quality pistons, rods, and gaskets for a complete, leak-free rotating assembly.