Perf. Piston Ring Set V8 4.000 Bore 1.2x1.2x3.0

The Perf. Piston Ring Set V8 4.000 Bore 1.2x1.2x3.0 from NPR PISTON RINGS is designed for high-performance V8 engines that require precise bore-matching and reliable ring geometry. This set is ideal for those rebuilding street engines, preparing weekend racers, or restoring classic muscle cars, delivering essential compression sealing and blow-by control for optimal horsepower and oil economy.

The 1.2x1.2x3.0 ring geometry—top ring, second ring, and oil ring dimensions—is specifically optimized for the 4.000-inch bore specification. This design maintains tight wall contact throughout the piston stroke, minimizing leakage while effectively managing thermal expansion under load. NPR's performance ring sets are crafted from high-quality steel with precise manufacturing tolerances to endure elevated combustion pressures typical of modified or boosted engines.

Engine builders and enthusiasts working with 4.000-inch bore blocks, commonly found in small-block Chevy, Ford, and Mopar platforms, will find this ring set particularly beneficial. Installation requires careful verification of piston-to-bore clearance and proper ring-end gap filing to suit specific engine combinations. This ensures optimal performance and longevity in demanding applications.