[Steeveedee]

Not sure what you expect to achieve. If the engine was left with only water in it, it could be good and corroded. Air won't help that. If it was left dry, it should be OK. Maybe get it running and use a cooling system cleaner if it needs it. Since it is out of the truck, take a good look at the freeze plugs and change any that look suspect, or just do them all. It's a ton easier now than when it's in the truck.