Perf. Piston Ring Set V8 4.065 Bore 1.2x1.5x3.0

The Perf. Piston Ring Set V8 4.065 Bore 1.2x1.5x3.0 is a precision-engineered compression and oil control ring kit designed for serious V8 engine builders and performance enthusiasts. This NPR piston ring set is essential for high-displacement or overbore applications, particularly in stroker engines and crate motor builds that demand tighter tolerances and enhanced sealing. Proper ring selection is crucial for maintaining cylinder pressure and controlling oil consumption.

The 4.065-inch bore specification accommodates oversized pistons commonly found in 427, 454, and 502 cubic-inch V8 builds. The ring stack configuration of 1.2mm for the top ring, 1.5mm for the second ring, and 3.0mm for the oil control ring balances compression sealing with blowby reduction. NPR rings are designed to withstand high-RPM operation and elevated combustion pressures, ensuring durability and performance.

This ring set is ideal for engine builders and mechanics who are restoring or upgrading large-displacement V8 engines, especially those utilizing aftermarket pistons. The graduated ring gap design and precisely machined edges ensure consistent hoop tension across the bore, preventing ring flutter and maintaining optimal contact with cylinder walls throughout the power stroke.