The supposed advantage of iridium plugs is they have a smaller electrode than platinum, so in theory they generate a hotter spark. The downside, as I see it, is that this technology is fairly new, so reliability may not be as good as platinum. I bought some Bosch platinum plugs back in the early 90's, and they only lasted about 5000 miles before one of the center electrodes drifted out and shorted the plug. That said, I just put a set of iridium plugs in my Triumph motorcycle and it ran very well afterwards.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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