Your engine block will be fine for up to a few minutes without water. The impeller and water pump are a different story. If your engine is running, then your impeller is spinning. The longer it spins without water, the more chance it has of being damaged. Even one second is enough to cause damage. If you want to run your boat just to make sure it will start (which I always do myself), use a fake-a-lake or muffs and do it in your driveway before you get to the ramp.
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