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If the valve timing is correct and there are no damaged engine parts (or weak/faulty valve springs) that should not happen, yet however if the engine is "over-revved" the valves could "float" which is not normal operation. (If the engine is an interference engine there may possibly be engine damage.)

That is normal and it is called valve overlap.

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Q: In a four stroke engine the time period when both valves are slightly open is called valve?
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In four-stroke engine the time period when both valves slightly open?

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