[Gasoline Fumes]

In most service manuals, drilling the head is recommended. If you're cutting a slot, cutting into the clamp a little is fine. I think I got these bolts out once by putting vise grip jaws on the top of the head and the other end of the bolt. Assuming it protrudes a little. I don't remember what car I did that on. I don't feel like going outside to look at a Metro column! Maybe tomorrow.