Mahle MS 3.937in +.005in 1.0mm 1.0mm 2.0mm File Fit Rings - Set of 4

When you're rebuilding the top end of your engine and need to ensure a solid seal between the piston and cylinder wall, a good set of piston rings is crucial. These Mahle MS file fit rings are designed for that purpose, helping to maintain compression and control oil consumption. They are a popular choice for many engine builders looking for reliable performance.

This set features rings with specific dimensions: a 3.937-inch bore size, a +.005 inch oversize, and a 1.0mm top ring, 1.0mm second ring, and 2.0mm oil ring. The 'file fit' designation means the end gaps on the top rings are designed to be adjusted by the installer to achieve the precise clearance needed for your specific engine build. This allows for a more custom fit, which is important for optimal performance and longevity, especially in performance or modified applications. Mahle is a well-known name in engine components, and these rings reflect their focus on providing well-built parts for engine work.

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 ring gap specifications.