MAHLE Original piston rings are the most technically advanced piston rings in the industry. Driven by OE requirements; reducing friction and ring mass while minimizing engine oil consumption, and providing longer service life. MAHLE Original piston rings lead the industry for the latest piston ring technology. PartNumber : mhl50620.040 Description : Engine Piston Ring Set Piston Ring Type : Standard Piston Ring Size : 0.040IN 1975-1977 Ford F-500 Custom V8.-cc Engine Components::Piston Rings