TT5.9mag said

Who cares what the total timing is. What is the timing at peak torque? That plug shows signs of distress for sure, but it ain’t the total timing that’s causing it. And with no full throttle, full load pulls reading the plug for fueling is useless. Looking at the plug, it’s detonating, it’s cold, and the total timing is a degree short of perfect. You need to work on the CURVE and get the timing out of it when it’s rattling. You might need to move to more octane in the short term just to keep it alive.

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TT5.9mag said

Says 92 octane in post 1.

Please @340inabbody post your timing map if you can. If I saw that plug I start by pulling 6-8 degrees from 1500-4000 on the map at all loads and tune back to it. There is something weird going on in your chamber (have you verified TDC on the balancer?) and I’d be overly safe to start tuning. Also, that plug shows your fuel ring is much too wide so after you get the timing situation figured out, you could strip some WOT fuel out of it.

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