This is a very nice used Original Ford Thermactor Smog Check Valve  for a 1968 1969 1970 428CJ 428SCJ 428 Cobra Jet Super CobraJet in a Mustang SHELBY GT500 GT500KR Torino Cyclone Cougar Montego Comet and Ranchero. This is also correct for 1969 1970 Boss 429 Mustang. This is Ford part number C8AZ-9A487-A and it has the FoMoCo stamp on the top. This is in extremely nice condition and most likely was an early takeoff. These are difficult to find and would make a great addition to your classic. If you have any questions or need additional smog parts please ask.   FREE USA SHIPPING.  Thanks for looking. (RKP092123BoxA)