Hey, as long as you guys are talking cooling system issues. I have one myself. My willys has a radiator that is lower than the engine and have had problems with coolant at hot idling temps coming out of my overflow tank. I have done a lot of thinking about this and have decided to install a moroso expansion tank at a high point on my firewall. they want the lower fitting on the tank hooked to an inlet hose and a smaller side upper fitting hooked to the radiator. It uses a radiator cap on the tank and still has an overflow nipple also on that neck for the cap. I have a weiand 8208 sbc water pump which has the lower hose hooked to it then right above that I have one heater hose hooked to it. The other heater hose is off the manifold. On the top of this pump is a threaded hole that I have plugged off..is this hole an inlet..or an outlet. weiand tells me it is an outlet, but the rather unfriendly tech person also tells me any heater hoses are outlets..duh, don't think so, and wasn't about to argue with him. I can't find any info anywhere on this. I had bought a Canton tank but returned that because they didn't know how it worked or how to hook it up. Maybe someone here has an idea about that pump fitting or has used one of these before. thanks..