I've gotten two stories on Locktite with head studs - both equally plausible . . .
A - NEVER use it. It centers in the threads, and when you draw it tight and then the engine gets warm, it breaks down just enough to loosen the clamp load on the head.
B - IF you use it, torque it immediately so the stud threads are drawn up tight into the threads of the block.
I don't know who to believe, so I used only one drop on the head studs toward the end with the shank, and I didn't bottom the stud down in the block.
One thing nice about ARP studs is that they have an Allens head in the end. When I assembled the engine, I left about 1/2 turn from the bottom and held the stud in place while cinching up the head. Then I torqued it down with ARP lube.
When I pulled the head a few weeks ago, most of the studs were loose enough to remove by hand.
So I still don't know who to believe . . .