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You're right about checking the thread depth in the head as being an indicator for sure, if the diameter of the threads are the same. I haven't seen the two plugs to compare them, but know that some plugs for different engines in general, aren't even the same diameter. That may not be your case. Ford for instance had a habit of using the shorter thread, but a huge diameter at the threads, where the longer smaller diameter threads would just drop into the head plug hole. That may not be your case. The sooting up might be fuel richness, dirty card or air cleaner. I'm going to try something in my B I've never tried before. Before you fall out of your chair, hold on. I'm going to try even the far more expensive premium grade. I know that sounds both insane, and like a waste of $$$, but in my gas vehicals, I've always run premium and still do. I get far better milage, the engines run better, I figure the cost difference offsets itself. In my company owned work truck, the accountants gave me what for over using premium, "wasting company money, blah, blah, blah" so I stopped. I've gone from about 320 miles on a tank to about 280, and now stop more often. I still figure the cost offests itself, but the accounts say "...we're warning you mister...". Their truck, they win. My gassers, I win. Gonna try premium in my B and see if it don't cut down on the sooting, which has to be better performance. Its just the thought of the salty price. But that B's never let me down, so I figure I oughta take good care of her as well.
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