intake mani- skip one bolt?

[FattyBoomBatty]

I can't really tell from the pics or the writing in the first post, but is the bolt broken off with nothing sticking out of the hole? If it had any on there, you'd probably be in a better situation.

Good luck with the diamond bits, but I am with the people who would get it out. I have helicoiled a head before and it's really not hard, plus helicoils, once installed, are stronger than the aluminum threads anyway. I'd definately try other things first though.