Piston Ring Set 4.040 1/16 1/16 3/16

The Piston Ring Set 4.040 1/16 1/16 3/16 is an essential internal engine component engineered for builders and mechanics undertaking serious engine work, overhauls, or custom modifications. Whether you're restoring a classic engine, rebuilding after high-mileage wear, or preparing a stroker or boost application, quality piston rings directly impact compression, blowby control, and oil consumption. This Hastings ring set is designed to seal the piston-to-cylinder wall interface, maintaining proper combustion pressure while managing crankcase ventilation and lubricant film thickness during all operating conditions.

This piston ring set features a 4.040-inch bore diameter with a carefully calibrated profile: 1/16-inch top compression ring, 1/16-inch second ring, and 3/16-inch oil control ring. The top two compression rings minimize blowby and maintain optimal gas pressure, while the wider oil ring prevents excessive oil from reaching the combustion chamber—critical for fuel economy and spark plug longevity. Hastings rings are precision-manufactured using proven metallurgy and machining tolerances, ensuring proper end gap clearance and consistent radial tension across the ring set. The design optimizes ring-to-groove fit while minimizing flutter and maintaining sealing performance across a broad RPM and load range.

Mechanics and engine builders rely on this piston ring set for 4.040-inch bore applications—common in small-block and mid-displacement engines where precision bore sizing and reliable sealing are non-negotiable. Proper installation requires a ring compressor, correct end gap verification, and careful groove cleaning to remove all machining residue. This set is ideal for complete engine rebuilds, performance cam conversions, and applications where new pistons demand matching ring sets. Always verify bore diameter and ring land dimensions before ordering, and follow OEM honing specifications and assembly torque values to ensure optimal ring life and engine performance.