First off start the engine & run it dry for about 30 seconds this should get most of the water out. Second close off all valves & fill your block with antifreeze until it overflows, this will elimante your block freezing, and then cracking. I also wash & wax, change the oil & filter, grease all zerts, & place an opened box or two of baking soda (absorbs moisture)in the boat before I cover it up & put it away for hibernation, in the garage. I'm on the left coast & freezing isnt much of a problem out here, but hope this helps. This is about the only things I do.