Perf. Piston Ring Set V8 4.005 Bore 1.2x1.2x3.0

The NPR Perf. Piston Ring Set V8 4.005 Bore 1.2x1.2x3.0 is designed for high-performance and rebuild applications in big-block V8 engines that require precision ring fitment. This ring set is ideal for restoring classic muscle cars, performing complete engine rebuilds, or upgrading worn ring sets in performance platforms.

Engineered for 4.005-inch bore diameters, these rings maintain critical ring gap tolerances and contact geometry essential for modern engine demands. Each ring in the 1.2x1.2x3.0 configuration—top, second, and oil ring thicknesses—is manufactured to OEM-grade specifications that ensure proper blowby control and oil consumption management.

Mechanics and engine builders working on 4.005-bore platforms, including late-model big-block and stroker applications, rely on NPR ring sets for consistent honing clearances and repeatable assembly results. Proper installation requires accurate bore measurement and honing to specification, ensuring optimal performance and longevity during high-load operation.