Originally Posted by lmsport
There are multiple Ford tech bulletins on the procedure. I like to start with a hot engine and spray each plug with Sili-Kroil and let it soak until the engine is just warm to the touch. Then, loosen the plug slightly and spray again. Then repeat until the plug has turned 1 revolution.
I hate to contradict you, but the latest Ford TSB have changed some of this info.
Here is the latest TSB
(I hope - and what I'm using to do my V10 plugs)