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 is an essential component for any serious engine build or high-performance V8 overhaul. Built by NPR, a trusted manufacturer in precision engine internals, this ring set is designed for builders and mechanics who demand reliability in demanding applications—whether you're assembling a fresh stroker engine, rebuilding a tired block for street performance, or preparing a competition powerplant. Proper piston rings are the critical seal between the piston and cylinder wall; without quality compression and oil control rings, you'll lose power, burn oil, and risk catastrophic engine damage.

This ring set features a 4.130-inch bore specification with three distinct ring profiles: a 1.2mm compression ring, 1.5mm compression ring, and 3.0mm oil control ring. The multi-ring configuration maximizes compression retention on the upstroke while managing oil film thickness on the downstroke—critical for maintaining cylinder pressure and preventing blow-by in a high-revving V8. NPR's performance-grade rings are manufactured to tight tolerances and often feature advanced surface coatings that reduce friction, improve ring seal, and extend ring life under sustained load. The precision engineering ensures consistent contact with the cylinder wall across the full bore diameter, delivering repeatable compression and controlled oil consumption.

This ring set is ideal for V8 engines with a 4.130-inch bore—common in big-block rebuilds, stroker conversions, and custom engine builds where displacement and compression are critical to performance. Proper installation requires honing the cylinder walls to the correct Ra finish, checking ring gaps, and using a ring compressor during piston installation. Whether you're a professional engine builder or an experienced DIY mechanic undertaking a full machine work project, the Perf. Piston Ring Set V8 4.130 Bore 1.2x1.5x3.0 delivers the precision fit and reliability needed to ensure your V8 builds last. Weighing just 0.85 lbs, this compact set is a critical foundation for any serious engine assembly.