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I'll put on my flame suit for this one. I'm confused. I want Motorcraft plugs in my car. Car is 94 Cobra with GT-40 Iron heads. The plugs I pulled out were Motorcraft plugs. They were half thread. The car ran like a beast for many miles with the original plugs. No issues. The equiv. plug...

Cal-Van spark plug thread repair kit - SOLD Cal-Van tools 38900 thread repair kit. I used one of the inserts. A real breeze to use. There's a dvd that comes with it. It comes with an air fitting to verify the valves are closed and then you put a guide into the opening and run the drill down...