I'm not trying to be contrary to mechanic58 but when I fixed my plug threads, the head was off and I was shocked at how many/much aluminum shavings were produced by the drill portion of the repair tap. I trust when he says it wont hurt the engine to have those in there, but duuuuude that's a lot of shavings! gives me the willies to think they would be in there <img src="/forums/images/graemlins/shocked.gif" alt="" /> The sleeves worked great by the way <img src="/forums/images/graemlins/kewl.gif" alt="" /> The previous owner had stripped out two plug threads about 90% down. only two intact thread revolutions per <img src="/forums/images/graemlins/rolleyes.gif" alt="" />