This listing is for a Hastings +.060" overbore moly piston ring set (P/N 2M139-60) for the following applications: 1977-79 Pontiac 301ci V-8 1967-85 Chevrolet 302ci-327ci-350ci V-8s 1971-94 Chrysler/Dodge 360ci V-8 1963-86 Ford 289ci-302ci V-8 1969-91 Ford 351C-351M-351W-400ci V-8 1957-66 AMC 327ci V-8 1956-63 Cadillac 365ci-390ci V-8 1965-67 Oldsmobile 400ci V-8 Piston rings specifications are as follows: CYLINDER DIAMETER: 4.060" (at +.060") TOP RING LAND: 5/64" Moly (compression) 2ND RING LAND: 5/64" Cast (compression) OIL RING LAND: 3/16" Stainless (deep)