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Old Sep 28, 2023 | 03:22 PM
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[QUOTE=NorthWestern;21399126]All stock engine (tune, etc.)? Not uncommon for a stock engine running a lean EPA tune. That is the hottest part of the engine. It is more common with fuel additives, as mentioned.[/QUOTE

Cam on top of the usual stage 1, no cat, head breathers sent to atmosphere.. power vision from fuel moto... plugs don't look bad
 
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Old Sep 29, 2023 | 07:29 AM
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Ash deposits from exhaust valve that was hot enough to faintly glow or near to it.
 
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