This listing is for a valve spring kit compatible with 1968-79 Chrysler Dodge Plymouth 383 400 440 Big Blocks. Kit comes with 8 intake valves, 8 exhaust valves, 16 valve springs, and 32 hardened valve locks/keepers. These valves are compatible replacements for 1968-71 383 400 440 big block V-8 cylinder engines S/N 383216000 and UP used in passenger cars and trucks. Valve specs: Int. Head Diameter: 2.080 Length: 4.873 Lock Style: 2 Groove, Exh.Head Diameter: 1.74 Length: 4.888 Lock Style: 4 Groove. Please measure your old valves to ensure the correct size you need. (16) RV869S + (8) E1717B +(8) I1316B + (16)EHC746-200 + (16) EHC766-200 ( OR EHC746R x 1 + EHC766R x 1)