Holley Strip Dominator & PCV

BJR Racing said

The only other way is to machine it out. If everything else failed.

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"Machine it out" how? I can't get the thing to budge, I tried an internal pipe wrench, easy out, etc.

The plug I used (temporary) is PCV. I'm guessing that's not a good thing to use, right? Have a look:

http://www.burwoodboysracing.com/gallery/v/Duster/2008/IMG_0612.JPG.html