I always supected the Italians were radical but I never would have in a thousand and one years they were free. I use copper cored plugs because Jacobs Engineering who manufactured my ignition system told me to.(they are cheap too). I have a plug board holding two sets of six plugs. Both are the same brand and heat range. The difference in these two and the set in the engine is the air gap. I am continuiously trying to find the best gap. The engine set is at 0.054 inches and indexed. What Joy to be a professional tinkerer.
Happy Trails Beep Beep from Houston
Donald, what's next?