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I was changing my plugs last night and all but one of the plugs came out with my fingers after I loosened them with a wrench. One had been previously installed cross threaded and needed a wrench all the way out. When I replaced it I put it back in with my fingers to a point but then it would not go farther by hand. I fiddled to try to find the original threads but could not so I finished it off with my socket. So my question is: What could go wrong with this plug? Could it blow out of the head? If I were to install a healy coil how would I keep crap from falling into the cylinder?
Thanks
Steve
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