That's why the racing plugs are better. If they're iridium, they really don't wear on that electrode, so you get consistent gap for the life of the plug. The TT series I mentioned previously has iridium on both electrodes, so it shouldn't wear at all. The ones Dan showed a pic of have only iridium in the center electrode, so the ground still wears. That's really the difference. And for <$10/plug, they seem to be a good value, considering it can be less than ideal to have a gap that wears a lot over time. I've run some standard plugs for a couple hundred hours (won't do that again) and had the gap get huge. Not so much with the standard iridium, and not at all with the TT.
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