[Canuck_Targa]

I always believed that the short end that goes into the jug was always an interference thread fit because even though you want them removable, you don't want them screwing out every time you are removing the manifold nuts. In my experience it is like that on all makes, Porsche, Chevy, Yamaha...........
The only time I think loctite is required is if you do have a problem with the studs backing out. Using loctite just makes them that much tougher to get out when you go to replace them again.
But thats just my opinion.