Perf. Piston Ring Set V8 4.160 Bore 1.2x1.2x3.0

The Perf. Piston Ring Set V8 4.160 Bore 1.2x1.2x3.0 is a precision-engineered ring set engineered for high-performance V8 engines requiring exact bore specifications. Built by NPR, a trusted name in aftermarket engine components, this ring set restores or upgrades compression, oil control, and blow-by management in competition and street applications. Whether you're rebuilding a tired engine block or optimizing a fresh short-block assembly, these rings deliver the sealing integrity and durability that separates a reliable power plant from one prone to leakdown and oil burn.

Manufactured to NPR's proven ring geometry, the Perf. Piston Ring Set V8 4.160 Bore features a three-piece configuration with 1.2mm top ring, 1.2mm second ring, and 3.0mm oil control ring—a layout that maximizes compression retention while minimizing friction and parasitic drag on the crankshaft. The 4.160-inch bore specification ensures precise fit in standard small-block and big-block V8 applications, reducing blow-by and maintaining stable oil consumption across the RPM band. Premium material composition and strict dimensional tolerances guarantee consistent ring gap and side clearance, critical for maintaining ring-wall contact and preventing the power loss and carbon buildup that plague inferior or worn ring sets.

This ring set is ideal for engine builders, restoration shops, and enthusiasts rebuilding Chevrolet, Ford, and Dodge V8s in the 350–454 cubic-inch range, as well as vintage muscle and classic drag racing platforms. Proper installation requires controlled bore honing to the correct surface finish (typically 20–40 microinches Ra) and careful ring end-gap filing for your specific engine clearances and intended boost or displacement. Installation should be performed by experienced engine builders or certified mechanics familiar with piston ring fitment, gapping procedures, and V8 short-block assembly best practices.