Mahle MS 4.125in +.005in 1.0mm 1.0mm 2.0mm File Fit Rings

This is a Mahle MS piston ring set, designed for engine builders who need to precisely set the ring gap for their application. These rings are a universal fit, meaning they are intended for custom engine builds or specific performance applications where standard sizes won't work. The set includes three rings: two at 1.0mm thickness and one oil ring at 2.0mm, all with a +.005 inch file-fit design, allowing you to customize the end gap for optimal sealing in your cylinder bore.

Mahle is a well-known name in engine components, and this ring set reflects their focus on providing parts for serious engine work. The file-fit design is crucial for high-performance or modified engines where bore tolerances can vary, or where specific compression and oil control characteristics are desired. This approach ensures a solid seal against the cylinder wall, which is key for maintaining compression and preventing oil from entering the combustion chamber. They are built to handle the demands of a rebuilt engine, offering a reliable foundation for performance.

Keep in mind that these rings are not CARB approved and cannot be shipped to California. If you're working on a performance build or a custom engine, these Mahle rings offer the adjustability needed for a proper seal.