Hello All; Much as it was an interesting explanation of the manufacturing processes of some different brands of spark plugs, I really think that the issue of spark plugs has been thoroughly exhausted by now. If you want to try one brand over another and find that you don't like them it's not really the end of the world to change them. I have noticed that there is far less discussion over what brand of pistons, rings, or gaskets to use in a rebuild then there is with spark plugs. Yet these parts are far more difficult to change and can cause much greater damage should something go wrong. I am sorry but it seems like every week there is a thread about spark plugs and the only impression that I can gather, which is the same every week, is to use Autolites. I subscribed to the Imperial Mailing List not the Spark Plug Mailing list, please drop this thread and move onto something more interesting. Best Regards Arran Foster 1954 Imperial Newport Needing A Left Side Taillight Bezel and other trim parts.