Mahle MS 4.000in +.005in 1.0mm 1.0mm 2.0mm File Fit Rings

Mahle is well-known for making solid engine components, and this set of MS file fit piston rings is no exception. If you're rebuilding an engine and need rings that allow for precise gap setting, these are a great option. They are designed for a 4.000-inch bore and come with a +.005 inch oversize to accommodate for any slight variations or machining tolerances.

This set features a 1.0mm top ring, a 1.0mm second ring, and a 2.0mm oil ring. The file fit design means you'll need to file the ends of the top and second rings to achieve the correct piston-to-wall clearance for your specific application. This level of adjustability is crucial for optimal engine performance and sealing, especially in performance or custom builds. They are standard tension rings, suitable for many common engine builds.

Keep in mind that these rings are not CARB approved and cannot be shipped to California. Always refer to your engine's specific service manual for detailed installation instructions and recommended clearances.