Hello all. I was wonder I anyone could help? I’m trying to change my spark plugs but one of the hex screw that go on that engine manifold is stripped and I can get it out. Anyone have any suggestions?? Thank you

 

You can try using a screw/bolt extractor

 

Not sure what that looks like, but assuming you can’t vice grips or Robo grips around the head, then either:

1) Take a dremel or cutting tool, cut through the shoulders straight across - make slots to insert a flat baded screwdriver.

2) drive a hex socket or allen key into it, weld it. Then remove it.