Perf. Piston Ring Set V8 4.000 Bore 1.2x1.5x3.0

The NPR Performance Piston Ring Set V8 4.000 Bore 1.2x1.5x3.0 is engineered for serious engine builders and performance enthusiasts looking to maximize compression, reduce blow-by, and extend ring life in high-revving V8 applications. These rings are essential for any stroker build, forced-induction engine, or stock restoration where OEM-equivalent durability meets modern performance standards. Whether you're rebuilding a small-block Chevy, Ford Windsor, or contemporary crate engine, this ring set delivers the reliability and sealing characteristics demanded by today's modified engines.

The 1.2x1.5x3.0 ring geometry specifies the top ring thickness (1.2mm), second ring thickness (1.5mm), and oil ring thickness (3.0mm) — a traditional configuration optimized for oil control, gas sealing, and durability across a wide RPM range. NPR's performance-grade rings are manufactured from premium cast iron with precise gap tolerances and smooth surface finishes that minimize wear on cylinder walls while maintaining superior compression retention. The 4.000-inch bore designation ensures exact fitment to your specific engine block, eliminating guesswork and guaranteeing proper ring-to-wall contact for consistent performance and longevity.

This ring set is ideal for engine builders who demand OEM quality without compromise, particularly in applications involving higher boost levels, extended idle times, or aggressive duty cycles where inferior rings fail prematurely. Installation requires careful honing to the correct surface finish and proper ring gap clearancing per NPR specifications — a critical step that separates successful rebuilds from costly comebacks. Compatible with any V8 engine featuring a 4.000-inch bore, these rings are a cornerstone investment in your engine's reliability, whether the goal is show-quality restoration or track-proven performance.