Mahle MS 4.165in+.005in .043in .043in 3.0mm File Fit Rings

These Mahle MS piston rings are file-fit, meaning you'll set the exact gap yourself during installation. This is a critical step for custom engine builds or when working with non-standard bore sizes, allowing for precise control over ring-to-piston clearance. The set features a low-tension design, which can help reduce friction and improve oil control in certain applications. The ring dimensions are .043 inches for the top and second rings, with a 3.0mm oil control ring, and they are +.005 inches oversized for a custom fit.

Mahle is a well-known name in engine components, and this ring set reflects their focus on providing parts for engine rebuilding and performance applications. The file-fit nature means these are intended for experienced builders who understand the importance of proper ring gap setting for engine longevity and performance. Because they are file-fit, they offer a unique advantage for engines that don't use standard bore sizes or require specific clearances for modified pistons.

Keep in mind that these rings are not CARB approved and cannot be shipped to California. Always refer to your engine build specifications and manufacturer instructions for proper installation and gapping procedures.