Originally Posted by
eb220
There are things called a "Heli-coil", and good engine shop will be able to put them in. But it will require the removal of the heads from your engine.
You could just do the spark plug threads that are damaged, but I would do all 8, it shouldn't be that much more, and will save having to take the heads off again should a spark plug be cross threaded later.
If you go down this route, you'll need to coat the threads of the spark plug in a compound that will stop the heli-coil and spark plug from "rusting/glueing" together. In the aircraft industry we use a variety of products (C2000 is one of them) but basically the product will have to be a graphite based compound that can handle very high temperatures.
Chris
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