All bolts were tight as hell. One last bolt I put everything I had on it, vice grips etc...
[Vehicle: 1995 Ford Mustang, 6 cyl]
This thing will not budge. Please help a brother out.Thanks
Three options, in that order:
generously spray with penetrating oil. Let it soak overnight, spay again and give it a go.
Heat the case and/or cool the bolt. (Torch and ice-spray)
Use a really long handle, will probably only brake the bold
Last option: Drill it out, reapair thread.
I can not comment as I am too new to the site: Have you tried ATF/Acetone 50/50 solution as a penetrating liquid?
You didn't mention an impact tool. You should really consider either pneumatic or electric before you do anything drastic. Borrowing one is a lot easier than fixing threads...