Super Jet Burn pattern on the domes

Anyone seen this type of omega looking burn pattern show up on a head before, and any idea what specifically caused it? The motor was run for about half a tank after purchasing it as a project motor, it was a poorly tuned (way rich) stock 62T/61X. Gonna give it the same ported love my current 710 has and find a used a/m hull for it to brap happily ever after in.

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