I had that happen years ago. As a last resort before pulling the head I tried to tighten it. It barely moved and then it would turn the other way. [sm=americanasmiley.gif]

 

well i got it, i sprayed pb blaster all over last night and let it soak in, and thena gian before i tried it. and yep sure enough it came out! i dunno if was because the engine was hot when i tried to pull it or what. but i got it to work. now check out the new thread i made and help me out there! thanks

 

re-threading tool that is unusual (and better)
because it starts from the inside most thread and works outward:

http://www.nextag.com/KD-Tools-KD-35...09/prices-html

http://cgi.ebay.com/ebaymotors/KD-35...QQcmdZViewItem

good luck