A friend of mine purchased a really nice modified Cadillac 365 "circle track" engine equipped with four Stromberg 97 carburetors mounted on a log manifold. I see what looks like a nut and stud combination on the right side of the float bowl of each carb. The nuts appear to be tack welded or sealed in place. Any idea what's going on here with the stud and nut combos? (See photos) I'm curious. Thanks in advance for your help.