I'll be curious to soon pull those plugs again and see how they're burning now that I'm kind of got the air-fuel mixture settled into where I like it. Again I still need to check wide open throttle. But yes those electrodes don't go all the way over like a normal spark plug they are race plugs. they're not quite the paper bag brown all the way around but are getting that way on the tips. They were pretty black before and running way too rich. it looks like they're starting to clear up if anything. But again I need to check them after some more drive time..