C8AZ-8509-D 1969 428 Super Cobra Jet only (V and W code axles), 1970 428CJ and 428SCJ prior to Sept 1, 1969. No air conditioning, power steering permissible. Three sheave pulley, 6-1/8 inches and 7-1/8 inches in diameter pulleys.
Ford casting number C8AE-8509-C was originally imprinted in ink, if you look closely between the two bonded together pulleys that make this pulley up you may be able to read the C8AE-8509-A stamped casting number from the two sheave inner pulley.