Mahle MS 3.572in +.005in 1.0mm 1.0mm 2.0mm File Fit Rings

These Mahle file-fit piston rings come in a 1.0mm, 1.0mm, 2.0mm configuration, meaning the top ring is 1mm, the second ring is 1mm, and the oil control ring is 2mm. The set is also specified as +.005in, indicating they are designed to be filed to achieve a precise top ring gap of 0.005 inches over the piston bore. This level of adjustability is crucial for performance engine builds where controlling blow-by and optimizing compression is key.

Mahle is a well-known name in engine components, and this ring set reflects their focus on precision. The file-fit design allows experienced engine builders to tailor the ring gap to the specific cylinder bore and intended use of the engine, whether it's for a high-performance street application or a dedicated racing machine. Proper ring gap setting is essential for sealing, oil control, and overall engine longevity.

Because these are file-fit rings, they are intended for custom engine builds and require careful measurement and filing by the installer. They are not a direct replacement for stock, off-the-shelf rings unless the engine build specifically calls for this type of setup. Please note that these rings are not CARB approved and cannot be shipped to California.