Piston Ring Set 4.145 5/64 5/64 3/16

The Piston Ring Set 4.145 5/64 5/64 3/16 from Hastings is a critical engine rebuild component designed for high-performance and street applications where ring durability and compression sealing are non-negotiable. This OEM-quality piston ring set represents the precision engineering demanded by mechanics and engine builders who understand that piston rings are the sealed interface between combustion pressure and crankcase oil—any compromise here translates directly to blow-by, oil consumption, and lost power. Whether you're rebuilding a stroker, refreshing a tired long-block, or restoring a vintage performance engine, this ring set delivers the gas sealing and oil control that separates a tight, efficient engine from a leaky, fuel-hungry nightmare.

The 4.145-inch bore diameter accommodates mid-sized displacement engines common in street rods, light trucks, and muscle car restorations, while the ring thickness specifications—5/64 inch compression, 5/64 inch secondary compression, and 3/16 inch oil control ring—follow proven metallurgical and pressure-containment geometry developed by Hastings, a tier-one OEM ring manufacturer. These specifications ensure optimal radial and tangential pressures against the cylinder wall, minimizing friction losses while maintaining superior sealing across the full RPM and load range. The piston ring set's hardened iron construction resists scuffing and provides thermal cycling stability, critical when engines see sustained high heat or variable operating conditions where ring flutter and blow-by become problems.

This piston ring set is ideal for rebuilders and engine shops completing short-block assemblies, crate engine final builds, or vintage restorations where OEM specifications and reliability are paramount. Installation requires precision honing of cylinder bores to the correct finish and Ra value—typically 32 to 63 microinches—to achieve proper ring seating and oil control. Verify your engine's exact bore diameter, piston pin height, and ring groove dimensions before ordering, as piston ring sets are application-specific and not interchangeable across different engine blocks or displacement variants. Proper ring gap filing and end-gap checking during assembly ensure optimal performance and longevity under sustained load.