Not Ranked
I have seen several pistons eroded exactly like that.
Last one I disassembled was a case of:
pump gas + 11:1 comp + too much advance + a dozen laps on a racetrack = a matching set of burned pistons
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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