Yeah, that would be functional, but it would not be attractive. A small, long bolt would be sufficient, or even a small, long clevis pin with a retainer, but all would look a bit too redneck for my taste. I actually read a post from a guy who did exactly that, and over time the hole in the header elongated from the pressure, heat and vibration. He overdrilled, installed shallow bronze bushings in the header collector, and reinstalled. Not the look I want, but thanks.