This is my first post on the forums, as I've only been a jet boat owner for about a week now. Last week, I bought a 1972 Sidewinder Lo-Pro in Pittsburgh, PA, and trailered it down to Annapolis, MD where I'm stationed currently. It has a '71 Olds 350 in it, out of a Delta 98 with 50,000 miles.
I started going over the boat with a fine-tooth comb to see what all would need to be done, and I'm completely confused about the cooling system. It has a water pump (not sure why, shouldn't the pressure from the Jet-Pump be more than enough to push water through the block?). It appears that water is tapped off the pump, run through the oil cooler, then enters the block at the top of the thermostat housing. From here, two lines run to the front of the headers, and one large line (radiator hose size) runs from the thermostat housing to the water pump (runs from where the upper radiator hose would hook up on a car, to where the lower radiator hose would hook up.) I couldn't find an outlet, so I'm assuming all the water runs through the block back to the thermostat housing, and is then dumped out the exhaust?
Other than the fact that there is a water pump, I'm confused how this system works. Do I have it traced correctly, or am I looking at this wrong? It seems to me like there should be a dump somewhere to relieve pressure. It also seems to me that the water pump would be way over-pressured at the inlet, as it is fed from the Jet-Pump.
Here's the diagram I drew up in paint to try and show what I'm talking about:
Thanks guys, I really appreciate the help!