Running coolant in the block. Closed system with Meziere 55gpm pump and tube type heat exchanger. Boat is a v-drive Hondo hydro. Picks lake water up at rear of right sponson. Will force feeding it through the exchanger on the lake side work or do I need a sea water pump. You can see my heat exchanger in pic, black tube lower right. Looking for input before towing it 500 miles to do some testing. I have a Mercury sea water belt drive pump but I am running out of room to belt drive stuff of the engine.