These are from a fresh build, 3000k on a 200cid. The Autolite #46 plugs have 1500k on them, and there seems to be more build-up (White) than I would have expected.
I have cleaned and reinstalled them. The picture shows from the left cyl # 1 - 6, so I mixed the order when I reinstalled them and will pull them in 1500k
to see how they compare.
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