The j heads are original and the push rods are off set with a left and right rocker u cant run straight rockers because the push rods will rub the head casting with out taking the heads off and doing some modifications on where the push rods go through the head casting hole so a straight roller rocker will not work the cam I put in is a comp cam 20-670-4 474 intake 474 exhaust 280 i/e lift 110 seperation
