Well here's the thing: There are different needs and different plugs. Keep apples to apples and so on. Across the board, all things equal, I would say I like Autolites for autos, and NGK for bikes/snowmobiles. Plugs have different coating like Champion, so they won't rust as fast if that is an issue. And you can get specialty plug like fine wire electrode which spark better at idle and don't foul, if that is a problem.
I have tried all plugs over what 30+ years and have stayed with Autolites in my dragcar and a MSD7AL-3 box with good results, but I've tried them all - BOSCH plugs are pretty good too.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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