Exhaust Manifold Stud Removal

[Blue666]

Ok, I found a nice pair of ram's horn manifolds with a y-pipe and a heat riser. The y-pipe nuts came right off but the studs are rusted with threads missing.

I have been soaking the studs with nut buster every few nights, trying to turn the studs either forward or back to start some movement. I have heated studs & manifold ears but the studs are still stuck.

Do I just grind off the studs & drill & tap the holes? Does anyone have any sure fire, never fail tricks to get these out?