Spark Plug "Reading"

[Hillclimber]

All plugs are out of the V8.


6 of them are showing slight rich, but number 1 & 3 cylinder have totally different appearance. The ceramic centre is only coloured in about 45 degrees of its circumference, looks like vapour “Washing” effect?


Any thoughts.

[LakeFever]

Look a bit washed but that center electrode looks a bit white? Or is it just clean? If it’s white and washed maybe too hot a plug? I was taught to use the coldest plug possible and lean it to the white ring around electrode. Sled stuff though and the temps are cooooold so it might be different. There’s experts on here I’m sure will help better I’m doing my best but also hoping to learn a bit more too. Chaz posted this yesterday I have yet to read it but it looks like and excellent resource


https://www.strappe.com/plugs.html