I thought you were referring to a thermostat bolt? Anyway you have a MIG? Weld a nut to that bolt, and then see if it will come before it cools down. It used to be if one was GOOD and I mean knew WTF you were doing with a cutting torch, you could blow a steel bolt out of an iron casting
I am working on a thermostat bolt. I don't want it to look like the other 8 manifold bolts. And yeah, I've managed all the 3/8 bolts on the exhaust manifold centers, The outsides been broke since the 80s. Thems a challenge. But anyways,
So, concluded I guess I need that hose, and leaving it open throat.