1972 Plymouth Valiant 4 door Auto Slant 6

ESMSpartanGarage said

I was able to drill out the center.

Is it best to weld a nut to it?

Click to expand...

Drill out as large as possible without damaging head threads.Heat and allow to cool, use a easy out.
What threads that are left from the stud should fracture and fall out.
Take your time.