For sale two sets of rocker arm studs taken out of two brand new sets of 1388 AFR heads, nothing has ever been on these studs. They are 3/8"s in size, two sets of 16 each. $25 per set. I used 7/16'th so these were removed. They are 1 7/8" from the bottom flat part of the stud that sits on the head to the very top of the threads. 3/4" of thread goes into the head.