Perf. Piston Ring Set V8 4.145 Bore 1.2x1.2x3.0

The Performance Piston Ring Set V8 4.145 Bore 1.2x1.2x3.0 from NPR Piston Rings is engineered for high-performance V8 engines requiring precise ring geometry and superior sealing characteristics. Built for builders and enthusiasts who demand OEM-quality specifications or enhanced performance in stroker, bored, or modified big-block engines, this ring set delivers the compression stability and blow-by control critical for reliable power output. Whether you're rebuilding a street engine, prepping a race motor, or restoring a classic V8, selecting the correct bore size and ring profile is non-negotiable for longevity and peak efficiency.

This piston ring set features a 1.2mm top ring, 1.2mm second ring, and 3.0mm oil control ring configuration—a proven profile that balances compression sealing with reduced friction and improved oil management. The 4.145-inch bore dimension accommodates large-displacement V8 applications, including modern LS platforms and classic big-blocks when bored or stroked to that specification. NPR piston rings are manufactured to tight tolerances, using premium materials and precise coating processes to ensure consistent gap closure, minimal wear rates, and extended engine life. The optimized ring profile minimizes friction drag while maintaining robust sealing across all rpm ranges and boost conditions.

This ring set is ideal for V8 rebuild kits, high-performance machine shops, and engine builders working with 4.145-bore configurations on street, strip, or track applications. Installation requires proper ring gap filing, piston groove inspection, and correct orientation—standard practice for any serious engine build. Verify your bore diameter, piston-to-ring clearance specifications, and ring groove dimensions before ordering to ensure perfect fitment. Pair with quality pistons, rods, and bearings to maximize the performance potential of your V8 build.