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Head doesnt have to be removed, been there done that with a 4V 4.6 DOHC engine. Stripped the spark thread doing a spark plug change, had it towed to a shop, took them 2-3 hours to heli coil it and never had any issues. Definitely take it to a professional shop to avoid any additional damage. I rememeber they said they put red lock tight on the outter side of the helicoil before threading it in too.
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