Dual quads versus big hammer!!!...

318willrun said

one step hotter plug would help clean that up.... (I've said this before I think... LOL)

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I thought it was funny how the two plugs look a bit different especially on the porcelain. I'm getting about two or three rings of heat. I know the angle on that one doesn't look so but I've already went a little bit hotter than I used to be before..
of course when I put those aluminum heads on they want you to run a colder plug and also let's not forget about the other thing that I'm going to try that wants two heat ranges colder...