Mahle MS 4.180in +.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 bore size, a file-fit ring set like this Mahle set is what you'll reach for. These rings are designed to be precisely filed down to achieve the perfect clearance in your cylinders, which is crucial for proper sealing, oil control, and overall engine performance. Mahle is a well-known name in engine components, and this set offers a solid option for getting your engine back in top shape.

This particular set features a 1.0mm top ring, a 1.0mm second ring, and a 2.0mm oil control ring. They are specified as being 4.180 inches in diameter and come at a +.005 inch oversize, meaning you'll need to file them down to match your cylinder bore. The file-fit design gives you the ultimate control over the ring gap, allowing for a custom fit that stock, pre-gapped rings might not achieve. This is especially important in performance applications or when dealing with worn or re-bored cylinders.

Remember that these rings are not CARB approved and cannot be shipped to California. If you're working on an engine rebuild outside of California, this Mahle set offers the adjustability and quality you need for a successful build.