My 97 expy blew a plug about 8 months ago. I put another plug in at the time and it ran just fine till yesterday. The same plug blew out again. I tried to install another plug but the threads are gone gone gone. I have researched the alternatives. Engine in - re tapping ,heili-coil or new head. What do you folks think is the better idea (they all suck to me). I'd like to JB weld the plug in and sell it. However, I was not raised that way.