Mahle MS 4.050in+.005in .043in .043in 3.0mm File Fit Rings

When you're rebuilding an engine and need to get the piston ring end gap just right, Mahle's file-fit rings are a solid choice. These rings are specifically designed so you can file them down to the exact clearance your engine needs, which is crucial for proper sealing and performance. This set is sized at 4.050 inches with an additional .005 inch allowance, and features a modern low-tension profile with a .043 inch top and second ring, and a 3.0mm oil ring.

Mahle is a well-known name in engine components, and these rings reflect that. The file-fit design means you'll need to carefully measure and file each ring to achieve the perfect gap for your specific cylinder bore. This allows for improved sealing and can help prevent oil consumption and blow-by, especially in performance or heavily used engines. They are a popular option for engine builders who want that extra level of control over their build's critical tolerances.

Remember, these rings are not CARB approved and cannot be shipped to California. Always refer to your engine's specific service manual for the correct ring gap specifications and installation procedures.