Someone told me: "Our engines are what Ford calls "J" codes. They are the only 4 barrel (4V in Ford speak) 302s, except for the Cleveland headed Boss series. J code heads have 53.5cc combustion chambers to give 10:1 compression vs standard
302 heads that have 63cc chambers and 9:1 compression."Can anyone confirm this and give me years of manufacture and any other details?
Ron Patterson