Cooling System Fitting Removal Help Needed

The article talks about it being in the manifold because that's where it is on a V8 engine. On the \6 the fitting screws into the head but the suggestions in the article are still correct.

In the end you might wind up breaking it off and having to drill it out then retap the hole at the next bigger thread size. Then install a (brass!) new fitting with the new thread size and the correct hose barb size.