I am trying to winterize a boat that is new to me and I don't know much about it yet. This was my first season with it and it has a OMC 460 and my old boat had a Merc 2.5. They are a little different. I found a wing nutt type water valve on each side of engine block. However I can't seem to find manifold drain plugs? Also I am not totally sure which radiator hose to put the rv coolant in. THANKS FOR THE MUCH NEEDED HELP!!!