My crate motor is going in my hot rod. The oil pan has a gasket leak. I hate oil leaks.
Vise grips will work or drill hole in end and tap a Allen whrench into hole . They come out pretty easy .
Tack weld something on to it.
If you dont plan on using them again, i just tack welded a nut on and then just used a wrench or socket to get them off.
If you plan on reusing them on the other hand, theres lots of dirty secrets to get them off and reuse them.