Perf. Piston Ring Set V8 4.040 Bore 1.5x1.5x3.0

The Perf. Piston Ring Set V8 4.040 Bore 1.5x1.5x3.0 from NPR Piston Rings is engineered for serious engine builders and performance enthusiasts undertaking V8 rebuilds, overbores, or high-performance modifications. This complete ring set addresses the critical role piston rings play in sealing combustion pressure, controlling oil consumption, and maintaining engine efficiency under demanding conditions.

The three-piece ring design features a 1.5-inch top ring, a 1.5-inch second ring, and a 3.0-inch oil ring thickness, specifically sized for 4.040-inch bore applications. This ensures a precision fit and optimal sealing geometry, calibrated to manage peak firing pressures, minimize blowby, and regulate oil film thickness on cylinder walls across the full RPM range.

NPR rings are manufactured with attention to material composition and radial tension, critical factors that determine how effectively rings maintain their sealing properties under thermal cycling and mechanical stress. This piston ring set is ideal for V8 engine builders working with 4.040-inch bore diameters, including common overbore applications on small-block and big-block platforms.