@CruiserTrash The horns will swivel. Likely the machine shop tacked them prior to resurfacing and then cut the tacks. That is the best way to do it.@HemiAlex I missed the welding on the #1 cylinder exhaust horn. What was that about?
Also, @HemiAlex, I used the plasma to cut the exhaust flapper out of one of my trucks and had the machine shop to tap the bronze bushings and install set screws. The truck sounds fantastic without the flapper restriction and not having the flapper doesn't appear to be overheating my intake at all. I think removing the flapper is the way to go, and I'll be doing it again in another truck of mine in a few weeks.