Mahle MS 4.160in +.005in 1.0mm 1.0mm 2.0mm File Fit Rings

When you're rebuilding the top end of an engine, getting the piston rings seated just right is critical for performance and longevity. These file-fit rings from Mahle are designed for that precise job, allowing you to custom-gap them to your specific cylinder bore for an improved seal. The set includes three rings per piston: two compression rings measuring 1.0mm thick and an oil control ring at 2.0mm.

Mahle is a well-known name in engine components, and this set is built to meet the demands of an engine rebuild. The file-fit design means you'll need to carefully measure your cylinder bore and file the ends of the top compression ring to achieve the correct end gap. This process ensures the ring expands properly within the cylinder, creating a solid seal against combustion pressure and preventing blow-by. The included oil ring works to scrape excess oil from the cylinder walls, helping to control oil consumption.

Remember that these rings are not CARB approved and cannot be shipped to California. Always refer to your engine's service manual for the correct procedure on measuring and filing piston rings to ensure a proper installation.