Mahle MS 4.010in +.005in 1.0mm 1.0mm 2.0mm File Fit Rings

If you're rebuilding the engine in your classic car or performance build, getting the right piston rings is crucial for proper sealing and compression. This Mahle MS file fit ring set is designed for builders who need precise control over ring end gap. The rings are made to be filed to your exact cylinder bore, allowing for a custom fit that maximizes performance and longevity.

This set features a 4.010 inch bore size, with an additional 0.005 inch allowance for filing. The ring dimensions are 1.0mm for the top ring, 1.0mm for the second ring, and 2.0mm for the oil control ring. This specific sizing and file-fit design means you can achieve the optimal end gap for your engine's specific bore and operating conditions, which is especially important for high-performance or modified engines where standard rings might not offer the perfect fit.

Remember that these rings are not CARB approved and cannot be shipped to California. Always refer to your engine's specific service manual for proper installation procedures and recommended end gap specifications when using file-fit rings.