Plugs for all FE Thermactor cylinder heads (390-4V, 427-4V, 428CJ) and 1968 289 / 302 cylinder heads (casting number C8OE-6090-K) with the Thermactor tube holes. OEM plugs for the elimination of your Thermactor smog system or for replacing the "Home Depot" pipe plugs. Sold individually, a set of is 8 needed, one for each cylinder.
Thread pitch 1/2" x 20
*Note - Export cars that did not require smog had a much shorter version of this plug installed at the factory. The plug shown here would be considered an over the Ford counter service part.