Those locknuts would not come off the studs, but the studs would still unscrew themselves out of the head. I can try locktite on them, but I've used heat before on red locktite, and it doesn't take much to melt it. That connection is about the hottest place on the engine. If I can find some longer studs, I could use a split lock washer under the nut, and that might put enough tension on the whole thing to keep it from coming loose.