OPPS: I spliced the two heater hoses to mate the lines running to and from the heater system inside the cab to the new engine I installed. At the time it just seemed easier to link the two hoses together. Findind hoses with the right kind of bends seeing as this is not a stock setup anymore is going to be a real pain. I agree that would be best, but probably not going to be doable.

CJM: The hose in question comes from the back of the block right behind and between the valve covers. The splice is between there and where the hose connects to the heat/cold valve on the firewall.