Are the rocker arms/ valves in the 302 adjustable? If so could I get a quick run down on how to? Is it an interference engine? Have gas blowing back into intake. Had to replace a bad rocker arm. They are aftermarket summit brand rockers 1.72F. Trick flow intake, e cam. Normal stuff. Thanks guys! Cordova midnight madness is tomorrow night and I'd like to have her running for the track!!

 

They are non-adjustable