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BAD news, I'm afraid. It's almost certain that the engine being over-revved has caused the problem. That doesn't mean that you have revved it hard through the gears. It's more likely because of a missed gear when shifting down through them. It's possible that a lower gear than the one you intended to select has been selected and the engine has momentarily over-revved as a result. It doesn't take much to bend a valve.
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