COMP Cams Super Valve Locks +.050 11/32lock angle and 11 32" valve stem size. They are recommended for all Race Applications because Super Locks have a wider angle 10 Catalog User 1 This Part Fits: Year Make Model Submodel 1972 Buick Centurion Base 1980 1981 Buick Century Base 1979 Buick Century Custom 1980 1981 Buick Century Estate 1979 1981 Buick Century Limited 1979 Buick Century Special 1979 1981 Buick Century Sport 1974 Buick Electra 225 1974 Buick Electra 225 Custom 1974 Buick