[Michael C Henry]

As I remember they have 3/8" heads, and I have a lot of wrenches angle head ,box and so on, some home bent and so on. Some of the bolts have to go in a little at a time as you bring the whole bunch in to the head. and you know about annealing the copper gaskets before you install them. Bring em all a little untill tight. Watch the clips, sometimes they fly.