Mahle MS 4.125in+ .005in 1/16in 1/16in 3/16in File Fit Rings

When you're rebuilding an engine and need to set the piston ring end gap precisely for your application, Mahle's file-fit ring sets are a solid choice. These rings are designed to be filed down to the exact clearance needed for your cylinder bore, which is crucial for proper sealing and performance, especially in modified or high-performance engines. This particular set is for a 4.125 inch bore and comes with the standard 1/16 inch top and second ring sizes, paired with a 3/16 inch oil ring. The +.005 inch sizing means they are slightly larger than standard, giving you a bit more material to work with when filing.

Mahle is a well-known name in engine components, and these rings are made to their usual standards. The file-fit design is common in performance builds where precise control over ring tension and gap is important. You'll need to carefully measure your cylinder bore and use a ring-gapping tool to achieve the correct end gap for your specific engine combination. This ensures optimal compression sealing and oil control.

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 for your build.