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. New Old Stock 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.
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