Here are some plugs out of my race car. These are #9’s and the a/f was around 3.9 on methanol, about 27 deg or timing. Map sensor was not reading correctly, so boost was somewhere in the 25-35psi range from a Garrett GT55-98. These had about 3 passes on them, but they were not pulled from the engine for 2 weeks, so they look a lot worse than if you pull them right after a pass. The shinny cadmium on the plugs, usually turns white as it starts to burn, then eventually goes to bare metal as it gets hotter. SBC, turbocharged, methanol. Just general plug info. NGK Spark Plug Reading Gap Turbo Methanol
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