Water through Intake Manifolds

The water gets sucked in the bottom hose and is pushed through the block from the bottom up. Through the heads and out the upper hose in the middle of the intake.
Where the hell do you think the water is going to exit the block if you close the intake off?

You'll have to put outlets in the head and run a Y-pipe for the upper hose unless you put two hoses in the radiator. The cross over you want to eliminate is the return for the water to the radiator. The only way to do what you want is to get an Air Gap intake. The outlet passage is not connected directly to the intake runners

This attached ad this intake has 4 outlets threaded in the water outlets at the 4 corners at the head. Small block chevy . You can do this. And you can use them for what ever your heart desires . But in reality you are wasting your time if you think that is going to increase any power on a cast iron intake. Your intake is going to be the engine block water temperature no matter what you do with that water cross over.

Edelbrock 7501: RPM Air-Gap Intake Manifold 1955-86 Small Block Chevy 262-400 | JEGS

Here is a picture of my motor with an Indy air gap. With a digital thermometer the intake is no cooler than the heads below it. Now if you have a exhaust crossover yes the center of the intake is hotter in the center under the carb. Doing a eliminator gasket set is all you can do to benefit heat exchange from the exhaust temperature.

Steve 050 - Copy.JPG