I sheared off the threads of a header stud. Any advice? I sprayed with a penetrant last night and today I plan to drill into it and try an ez-out extractor. Then plan to make a new one out of a 6mm alloy steel screw.
Drill it? Unless I’m looking at the wrong stud you still have some exposed. Like mentioned. Heat, penetrate oil, and patients. Grip the stud as close to the head as possible. Loosen, tighten, loosen more, tighten, do this back and forth till it’s freed up. Caution, these can be deceiving and you can see the stud moving but it’s really twisting below the surface. I snapped 2 off thinking they were moving but not. Take your time. You could try several heat cycles before attempting to remove. Tapping on the stud sharply but not hard has also worked, as it shocks the stud releasing the bond.