I can’t directly answer your question but I can tell you that you should not use a rocker arm or rocker assembly from the 59 and up motors. In 59, the oiling system was changed to provide a more direct feed from the main lifter galley for the oil to the rockers (as opposed to bleeding oil from the rear cam bearing), enlarging the oraface in the head to provide a greater volumn under slightly greater pressure, and used a pinched off connector between the two rocker assemblies. This created a sort of pressurized system that was less prone to clogging up then the 54-58 version of the 235. Keep in mind that the rockers still needed to only dribble oil, not spit, but dribble. With the higher pressure and greater column, gm then modified the rockers. So if you look inside the rocker of a 54-58 rocker arm, you will notice that there is a groove machined inside the rocker arm and that the groove directly intersects the dribble hole drilled in the rocker arm. If you look at a 59 and up rocker arm, you will discover that the groove is now offset from the dribble hole. This is how gm dealt with the extra volumn and pressure so you should avoid using a later rocker on an earlier motor.
Last edited by Dragsix; 02/26/2018 4:26 AM.
