JR,
This might be totally old news but Eric at South Main 9almost 12M channel views) has done several exhaust manifold and stud videos. MIGHT be a tip in here, maybe not.
But he also has done other engines where the stud breaks off nearly flush and he welds a nut on the broken exposed stud and gets success that way. Starts at about 11:30 min mark.
This might be all old news, but ain't much else going on right now.
Good luck,
Gary
Thanks Gary. The guy is good! A bit of a cowboy with the torches but good.
I've gotten fairly well versed in extracting. I've done the weld the nut to the stud on a few, the ones that break off in the hole I have this guy. It's been a savior.
https://www.nationaltoolwarehouse.c...A1rW19eQEWsGkUzFKeqYYaB0UIf7qI5BoC79YQAvD_BwE