Mahle MS 4.135in+ .005in 1.5 1.5 3.0 mm File Fit Rings

When you're rebuilding the top end of your engine, getting the piston rings seated correctly is crucial for good compression and oil control. This set of file-fit rings from Mahle is designed for builders who need precise control over the ring gap. The file-fit design means you'll adjust the end gap yourself to match your specific cylinder bore, ensuring a tight seal. This is especially important for custom builds or when working with non-standard bore sizes.

Mahle is a well-known name in engine components, and this ring set reflects that. The rings feature a common 1.5mm, 1.5mm, 3.0mm configuration, with the top two rings designed for file fitting to achieve the exact gap you need. The +.005 inch sizing indicates they are intended for a bore that is five-thousandths of an inch larger than standard, giving you a bit of room to work with or accommodate slight overbores. Proper installation of these rings will help ensure your engine runs smoothly and efficiently.

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 ring gap specifications and installation procedures.