Mahle MS 3.927in+.005in 1.0mm 1.0mm 2.0mm File Fit Rings

When you're rebuilding an engine and need to get the piston ring gap just right for your specific build, Mahle file-fit rings are a solid choice. These rings are designed to be filed down to the exact clearance your engine requires, which is crucial for optimal performance and sealing, especially in modified or high-performance applications. This set features a 1.0mm top ring, a 1.0mm second ring, and a 2.0mm oil control ring, all with a +.005 inch oversize to allow for initial sizing.

Mahle is a well-known name in engine components, and these rings are made to their standards. The file-fit design means you'll need to carefully measure and file each ring to achieve the correct end gap before installation. This process ensures a tight seal against the cylinder wall, which helps prevent blow-by and keeps oil from entering the combustion chamber. It's a step that serious engine builders take to maximize compression and engine longevity.

Remember that 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.