HI there,
there is a repair for this but you do need to drill out the old thread and re tap and insert a re coil thread, this will allow metal into the engine, and this is not recommended at all, just re cutting the old thread may result in a plug coming out while driving and doing more damage, I recommend removal of the head to repair this correctly.
Mark (mhpautos)
Tuesday, July 16th, 2013 AT 2:43 PM