Piston Ring Set 4.170 Bore 1.0 1.0 2.0mm

The Piston Ring Set 4.170 Bore 1.0 1.0 2.0mm from MAHLE PISTONS is engineered for serious engine builders and performance-focused mechanics upgrading or rebuilding high-displacement powerplants. Whether you're assembling a stroker, refreshing a worn engine, or preparing a build for competition, this file-fit ring set delivers the precision clearances and durability demanded by modern performance engines. MAHLE's reputation for OEM-quality components makes this an industry standard choice for custom builds and restoration work where reliability cannot be compromised.

This eight-cylinder piston ring set features a proven 1.0mm top ring, 1.0mm second ring, and 2.0mm oil ring configuration that balances compression sealing with blowby control across the entire RPM band. The HV385 thermal treatment applied to the steel rings provides exceptional hardness and resistance to wear, enabling reliable performance in high-boost, high-nitrous, and naturally aspirated racing environments. File-fit design requires precision honing and careful installation—a hallmark of professional-grade tooling that ensures optimal ring-to-bore contact and minimizes blow-by while maintaining steady oil consumption across extended service intervals.

Technicians rebuilding 4.170-inch bore engines will appreciate MAHLE's meticulous dimensional tolerances, which demand proper honing equipment and expertise during installation. This ring set pairs seamlessly with corresponding MAHLE pistons and is ideal for stroker assemblies, big-block applications, and any engine platform requiring tight, controlled ring clearances. Standard tension characteristics make it compatible with a wide range of combustion chamber designs, making it a versatile choice for both street and competition builds where precision engineering and proven materials directly impact longevity and performance.