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That... and then the corresponding pushrod may have jumped out of position, already. If lucky enough it isn't bent.
Reason enough (for me at least) to remove the covers and take a look.
First try to determine the cause. Do not... force it, e.g. by using the starter!
Yes, it could well be a valve, stuck open - as mentioned above. I would remove the rocker arm covers and check if all 16 valves are able to move freely. Also check the pushrods, if all in place and straight.
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