overflow/water level?

[flathead31coupe]

witch way does the water level in the tank go in relation to moving the box with the teeth in it up or down...

 

[Paul_N]

The higher you raise the overflow box the higher your water level will go in the Display tank. Also at the same time, your water level in your sump will get lower because for a moment no water will drain from the tank until it rises above the teeth in the overflow box.