Mahle MS 4.280in+ .005in 1.5 1.5 3.0 mm File Fit Rings

These Mahle file-fit piston rings are designed for builders who need to precisely control the ring gap for their specific engine build. The rings measure 1.5mm for the top and second compression rings, and 3.0mm for the oil control ring, with standard tension. They come at a +.005 inch size, meaning you'll file them down to achieve the exact clearance needed for your cylinder walls, which is crucial for optimal sealing and performance, especially in modified or performance engines. This level of adjustability helps ensure a solid seal, reducing blow-by and improving compression.

Mahle is a well-known name in engine components, and this ring set reflects their focus on providing parts that allow for custom engine assembly. The file-fit design is a practical choice for engine rebuilders who understand the importance of proper ring-to-wall clearance. By allowing you to custom-fit the gap, these rings help prevent issues like piston slap or premature wear that can occur with pre-gapped rings that aren't perfectly matched to the bore.

Because these are file-fit rings, they are intended for custom engine builds where precise measurements are taken and adjusted. Please note that these rings are not CARB approved and cannot be shipped to California. Always refer to your engine build specifications and manufacturer instructions for proper installation and gap setting.