Mahle MS 4.500in+ .005in 1/16in 1/16in 3/16in File Fit Rings

Mahle is a well-known name in engine components, and they're recognized for their focus on precision and performance. This set of MS file-fit piston rings is a prime example, built for engine builders who need precise control over their build's tolerances. The rings measure 1/16 inch for the top two ring grooves and 3/16 inch for the oil ring, with a +.005 inch oversize to accommodate specific bore sizes.

These rings are designed to be 'file-fit,' meaning you'll need to carefully file the end gap to achieve the exact clearance required for your engine's bore. This level of adjustability is crucial for high-performance or custom engine builds where standard, pre-gapped rings might not offer the optimal seal. The standard tension is suitable for a wide range of applications where extreme cylinder pressures aren't the primary concern.

Keep in mind that these rings are not CARB approved and cannot be shipped to California. If you're working on a custom engine project and need the flexibility of file-fit rings, this Mahle set offers a solid option from a reputable manufacturer.