SpringRetainerKeeper, 7 Deg, 11/32", 4 Grv Locks Ford 351C, Ford, 351, 351 Cleveland, 400, 351 Modified, 400 Modified, Ford F100, Mach 1, Mustang, Hardened Steel Set of 16 - 7 Degree, 11/32", 4 Groove Street Locks Ford 351C, None, Engine Valve Spring Retainer Keeper Kit.