Just wondering what you guys have done for tricks to remove broken bolts in the block. I have 3 manifold bolts that are broken off, both of the ones that are on the farthest most back of the manifolds, they're broken from a long time ago from GM's design, and also the very most front one on the drivers side, from me using a ratchet, instead of an air gun. I have heard of tricks of people using acetylene torches and heating them up red hot, then putting candle wax, or instead, then cooling them rapidly with ice. I've been soaking the bolts in WD-40 before work, and then after work to try and loosen the bind of rust. So hopefully this will help me. The only thing that's happened, is that the heads of the bolts have snapped off, they have a little bit of the stud still sticking out. So i was going to try and weld on a nut, then try and unbolt them like the other ones. Anyone have any suggestions?