Thank you in advance for any help regarding this 2000 Ford F250 Super Duty 2-valve SOHC 5.4 L exhaust stud issue. This is the most difficult removal of the studs out of the heads I've ever encountered after getting the manifolds off within the vehicle. Tools used include Stahwillie and SnapOn  stud removers, pencil right angle die grinder with high quality bits, drill/bits/screw extractors, Cobra oxy/acetylene torch (very precise, controllable flame), vise grips, and too much time. These studs, being different than any other 5.4 studs I've removed successfully in the past, are larger on the cylinder head end than the manifold end. Each stud (those that hadn't broke off the head while driving b 4 it got to my shop) are being extremely difficult to unscrew. I've used the tiny die grinder bits to remove material where the stud "swagged" or folded into the head. What do you cylinder head folks use to get these out if/when building these heads?