There are 2 bolt holes on the side cover with smaller holes (alignment holes) one on the lower left and one on the lower right. Tighten those first starting w the one on the right (rear of cover).
Good diagram twizted 1.
If i was going to take the channel plate off to do the 4th hub i would take off the valve body and do the boost valve while it was out and on a flat surface. Less chance of having to chase the check balls around. You would need new spacer plate gaskets or a new spacer plate with bonded gaskets on it (that's how they come from gm now). I probably have one of those too if you are interested. But that being said probably not totally necessary to change the boost valve if you don't want to deal with that.
Originally Posted by Twizted 1
