Perf. Piston Ring Set V8 4.130 Bore 1.2x1.5x3.0

The Perf. Piston Ring Set V8 4.130 Bore 1.2x1.5x3.0 from NPR Piston Rings is engineered for serious V8 engine builders and mechanics performing high-performance modifications. This ring set is designed to restore compression, reduce blow-by, and optimize combustion efficiency in big-bore V8 applications where factory specifications no longer apply. Whether you're rebuilding a stroker motor, increasing displacement through boring, or refreshing a worn engine block, quality piston rings are non-negotiable for reliable power delivery and engine longevity.

The 1.2 x 1.5 x 3.0 ring dimensions specify the top compression ring, second compression ring, and oil control ring thicknesses respectively—a staggered design that distributes pressure loads evenly and minimizes ring flutter at high RPM. NPR's performance-grade construction uses premium alloy steel with precise dimensional tolerances, ensuring consistent gas sealing across the piston groove and reducing leakage that steals horsepower. The 4.130-inch bore size accommodates mid-to-large displacement blocks common in LS, big-block Chevy, and big-block Ford platforms, making this set a versatile choice for custom engine assembly and machine shop inventory.

Experienced mechanics and engine builders trust NPR rings for rebuilds that demand reliability under sustained load and elevated RPM. This ring set suits fresh engine builds, displacement-increased engines, and any V8 application where OEM ring specifications are unavailable or inadequate. Proper installation requires precision honing to specification, correct piston-to-wall clearance, and ring gap verification—steps that separate professional rebuilds from amateur work. Weighing 0.85 pounds, this compact set ships ready for immediate use in your build, whether destined for street performance, racing, or heavy-duty truck duty.