[SuperB70]

I've noticed that those easy out taps are bad in same cases. They split and widen the bolt so its even more thighten.

Every place I can, now days I use tig to get those out. Little by little grow new crown to it, when its high enough weld a nut on and then comes the most important: then let it cool all the way. Dont try to turn even a little bit before. Will just broke the nut off.
Not so long ago, got a broken stud out off 6.0PSD head. Friend snapped one off when changing injector. You cant drill, you would have to remove the head. This way it was easy..