LOL good to see im not the only one that had that exact problem with that manifold. No amount of loctite fixed that problem. The nuts would undo themselves and i couldnt finish a 10 min final. Every run i would take the nuts and bolts out, clean with metho, dry, loctite and put the nut on it and it would come loose.
The way i fixed my problem? Got a rear exhaust engine. Never had a problem since.