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Detonation. If the valve spring isn't broken, you didn't get piston to valve contact on a single valve if the keepers were still in place.
How do all the other piston tops look? Which cylinder was this?
Are you running the stock DME? Given the laundry list of track car mods you have, I would seriously look into a standalone ECU with much greater flexibility and an actual knock sensing system instead of the ionic crap.
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