There are two sets of these quality reproduction 400-455 cast-iron exhaust manifolds available. The first, or early, set has the correct ’65-67 casting numbers, but fits ’68 models also. The second, or late, set of exhaust manifolds has the correct casting numbers for ’70-72 400-455's, but will also fit 1969 model big-block Olds engines. These manifolds come without attaching hardware and are available in pairs only.