Perf. Piston Ring Set V8 4.075 Bore 1.5x1.5x3.0

The NPR Perf. Piston Ring Set V8 4.075 Bore 1.5x1.5x3.0 is engineered for serious engine builders and performance enthusiasts who demand reliability in high-output V8 applications. Whether you're rebuilding a stroker engine, refreshing a tired block, or assembling a fresh short-block for competition, these rings provide the seal integrity and blow-by control necessary to maintain compression and oil consumption standards. NPR piston rings are purpose-built to handle the rigors of modern performance driving without sacrificing longevity or ring land durability.

This four-ring set features a 1.5mm top ring, 1.5mm second ring, and 3.0mm oil ring—a proven three-piece configuration that balances compression sealing with efficient oil control across the full RPM range. The 4.075-inch bore diameter positions this set for big-block or stroked small-block applications, with ring gaps and wall thickness designed to minimize blow-by while reducing frictional losses. NPR's quality manufacturing ensures consistent ring tension, proper coating adhesion, and dimensional accuracy that prevents premature wear on honed cylinder walls.

V8 engine builders, machine shops, and weekend warriors performing in-frame or complete engine rebuilds will appreciate the dependable performance these rings deliver across stock, naturally aspirated, and boosted applications. Installation requires proper ring gap filing and top-end clearance verification using precision feeler gauges before final assembly. Verify your exact bore size and ring land depths against the 4.075-inch specification before ordering, as piston ring fitment is critical to engine longevity and performance.