Manley performance piston rings feature a high performance, ductileiron top ring with a plasmamoly inlay. The second rings are constructed from reversetwist cast iron, and the oil rings are 3piece, standardtension rings. Manley performance rings are in both standard and file fit sizes. Choose the set designed for your engine application. Features. MAN Piston RingsCompatibility. Ford 5.0L DOHCSpecifications. Bore in. 3.630 x 3.635 in.. Bore mm 92.202mm. Top Ring Thickness 1.2mm. Top Ring Material Steel. Second Ring Thickness 1.2mm. Oil Ring Thickness 3.0mm