Mahle MS 4.125in+.005in .043in .043in 3.0mm File Fit Rings

When you're rebuilding the top end of your engine, getting the piston rings seated just right is critical for sealing and performance. This Mahle file-fit ring set is designed for builders who need precise control over the ring gap. The file-fit design means you can carefully adjust the end gap to match your specific cylinder bore, ensuring a solid seal and preventing blow-by. This is a popular choice for custom engine builds where exact tolerances are key.

This set features rings with a 4.125 inch bore size and a +.005 inch oversize. The ring groove dimensions are .043 inches for the top and second rings, and 3.0mm for the oil ring. Mahle is a well-known name in engine components, and these rings are well-built to handle the demands of a properly functioning engine. Remember that file-fit rings require careful measurement and filing to achieve the correct gap for your application.

Because these are file-fit rings, they are intended for experienced engine builders. Make sure you have the proper tools and knowledge for installation. Please note that this set is not CARB approved and cannot be shipped to California.