Once you get the broken plug out, you can chase the plug threads to clean them up before installing the head. The spark plug thread size is METRIC -14mm x 1.25 pitch. Don"t try to use anything else as you"ll booger up the threads and be in real deep doo-doo. Any good machine shop/mechanic should have a 14mm x 1.25mm tap to chase the threads. Now is the best time to do this as once the head is mounted, you won"t want to tap the holes as the chips/debris will fall down into the pistons. Also, anytime you need to pull the plugs, first use compressed air to blow off the head and blow out the plug wells real good so debris doesn"t fall into the engine once the plug is removed.
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