This listing is for sixteen (16) performance valve springs (single spring with damper), sixteen (16) chrome-moly valve spring retainers, and (32) 7-degree hardened valve keepers/locks compatible with Ford 289 302 351W. Spring Type: Single spring with damper, Outside Diameter: 1.460", Inside Diameter: 1.060", Seat Load: 115-lbs. at 1.820", Open Load: 245-lbs. at 1.320", Coil Bind: 1.230". Retainers: Outside Diameter: 1.400", 1st Step Diameter: 1.060", 2nd Step Diameter: .690", Material: 4140 chrome-moly Locks: Lock Angle: 7-degree, Valve Stem Size: 11/32"