Perf. Piston Ring Set V8 4.165 Bore 1.5x1.5x3.0

The Perf. Piston Ring Set V8 4.165 Bore 1.5x1.5x3.0 is engineered for serious V8 engine builders and mechanics rebuilding high-performance American engines. This eight-cylinder piston ring kit addresses the critical sealing function that directly impacts compression, blow-by control, and oil consumption—factors that separate a properly rebuilt engine from a mediocre one. Whether you're restoring a classic big-block, refreshing a performance crate motor, or rebuilding an original factory engine, selecting the correct bore diameter and ring thickness is essential for reliable operation and longevity.

This ring set features a 1.5 x 1.5 x 3.0 mm profile with standard tension construction, utilizing steel rings with nitride coating for enhanced durability and wear resistance. The nitride finish reduces friction while improving heat dissipation and hardness, allowing the rings to maintain proper sealing pressures across thousands of heat cycles. The 4.165-inch bore specification ensures precise fitment in engines designed to this exact diameter; oversizing or undersizing by even a few thousandths will compromise ring seal and allow excessive blow-by. The three-ring configuration—two compression rings and one oil control ring—provides optimal gas sealing in the combustion chamber while preventing oil from entering the combustion space.

This ring set is ideal for rebuilding a complete V8 engine or replacing worn rings in an engine showing signs of blow-by, excessive oil consumption, or loss of compression. Proper installation requires careful honing of cylinder walls to the correct surface finish (typically 20–40 microinches Ra), correct ring gap filing to specification, and proper ring orientation during assembly. Always verify your engine's exact bore diameter before ordering; the 4.165-inch specification fits engines specifically sized to this dimension. Pairing this kit with quality valve seals, gaskets, and fasteners ensures a professional rebuild that delivers reliable performance and longevity.