Originally Posted by GoneBoatN
Two plugs in the block (one each side), and disconnect the hose that runs between the manifolds/risers.
One side of the engine will likely have a knock sensor not a plug, just remove that and make sure water pours out of both sides of the block. Disconnect hose as stated above. You should pull the impeller after cranking the engine over to drain water from that area as well.
Where are you in VA, Lake Anna?
Nice boat.....Welcome to the X-star club!