Piston Ring 4.275FileFit Bore 1.0 1.0 2.0mm

The Piston Ring 4.275 File Fit Bore 1.0 1.0 2.0mm by MAHLE PISTONS is a precision-engineered component designed for high-performance and racing engine builds. This product is essential for engine rebuilds that require exact bore-to-ring clearance tolerances, making it ideal for classic muscle car restorations, drag racing platforms, or custom short-block assemblies.

This piston ring set features a 4.275-inch bore diameter and includes a three-piece ring pack: dual 1.0mm compression rings and a 2.0mm oil control ring. The file fit construction necessitates careful honing and installation techniques, allowing for optimal compression sealing and ring stability. MAHLE's manufacturing ensures consistent ring wall thickness and superior durability under high RPM loads.

Engine builders, performance machine shops, and experienced enthusiasts will find these rings particularly beneficial for stroked or bored small-block builds. The lightweight design minimizes inertial losses and enhances throttle response, while the precision gap fitment maximizes blow-by control and oil consumption management.