Piston Ring Set 4.145 Bore File Fit

The MAHLE PISTONS Piston Ring Set 4.145 Bore File Fit is designed for high-performance engine builds and top-end rebuilds where precision is crucial. This piston ring set is specifically made for engines bored to 4.145 inches, making it suitable for serious street and competition applications that require tight tolerances and reliable ring sealing.

MAHLE's file-fit ring sets come pre-sized for the 4.145-inch bore diameter but require final gapping and fitting to your specific piston and cylinder wall clearances. This ensures proper expansion under heat without ring blow-by or piston scuffing. The file-fit design allows builders to optimize end-gap clearance for their specific compression ratio, fuel type, and intended RPM range.

This ring set is ideal for engine builders, machine shops, and automotive enthusiasts engaged in complete top-end rebuilds on bored or stroked engines in the 4.145-inch bore range. Before installation, it is essential to verify your exact bore diameter, piston specifications, and intended compression ratio to ensure compatibility and determine the correct ring gaps for your application.