So I’ve started tearing down the engine so I can install ARP studs. Here is a picture of the engine when I started with just injectors and air cleaner removed. 1986 F350 6.9 idi. Next I removed the drivers side valve cover with a half inch socket or wrench. There is 8 bolts and 8 shims and the shims will fall off so pay attention to catch them when removing bolt.