360 LA installing Promaxx Aluminum heads

74Scooter said

Slow day.. spent the morning cleaning up the garage. You know how it gets after a major operation. Anyway I did get around to pulling a plug, this is #1.
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If I had to venture a guess that black smut is leftover from when it was running much fatter.

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Do NOT touch it. That’s what a pump gas plug SHOULD look like.

The only thing we can’t see is WOT. Cut the shell off and see where you are. Then screw in a new plug and make a clean cut pull at WOT and do it again. You can’t the fuel ring to be .080-.100 wide.