Im not a rookie, just a newbie to big block racing engines. I have an '03 525 efi and will be winterizing myself this year. It does not have a freshwater clean-out so everything runs through the outdrive. It does not have sea strainers and is strictly a freshwater boat, alway has been. My questions are this. I have pulled the four plugs on the manifolds and the one on the heat exchanger. Thats five (5); should be it?. If I pull the fuel filter and fill it half with 2 stroke oil, run till she smokes, should be good to fog the engine? Change the impellar and pump antifreeze from the outdrive through the headers, that should do it for winterization? Oh, I have checked the engine coolant and its good to zero and the tank is full of fuel.

i think there is six plugs one down under the oil pan fuel pump