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 : mhl40620 Description : Engine Piston Ring Set Piston Ring Material : Plasma-Moly Cast Iron Piston Ring Type : Premium Piston Ring Size : Standard Top Ring Thickness (Axial Height) : 0.0781 in Top Ring Material : Cast Iron Second Ring Material : Cast Iron Second Ring Thickness (Axial Height) : 0.0938 in Oil Ring Assembly Thickness (Axial Height) : 0.1875 in Oil Ring Assembly Material : Stainless Steel Item Grade : Premium Piston Ring Face Coating : Plasma-Moly Piston Ring Oversize : Standard Bore Diameter (in) : 3.875 1975-1977 Ford F-500 Custom V8.-cc Engine Components::Piston Rings