hooking up expansion tank?

i ran the radiator over flow to the bottom of my recovery tank. then a vent at the top of the recovery tank. radiator has a 16 lb cap, recovery tank has no pressure cap. i keep the recovery tank half full. oh, i used a canton racing tank with -6 AN lines i bent up. this setup seems to work for me. as the coolant gets hot it expands and goes into the recovery tank, when it cools down coolant goes back into the radiator.