In your answer, you mentioned a couple of extension-box manufacturers. Paul Smith Baja Marine WPM stands for Warlock Performance Marine. The owner of the company is Tom Stolarz. Among other things, WPM builds stand-off boxes and steering systems. The address is 392 Elizabeth Lane, Corona, CA 91720.
Water comes from a pickup on the back of the boat to a belt-driven pump.
It then goes into the crossover through the block and out the thermostat housing to a set of Lightning headers. The problem is that my water pressure is about 15 pounds at 3,000 rpm and before I even get to 4,000 rpm the pressure pins a 30-psi gauge. Because of this, I have had to replace three sets of intake gaskets because water was leaking into the oil. When I change them, the repair only lasts a little while before the leak returns. I think the water pressure is way too high and is causing the problem.