Confused on Heater Control Valve for 1975 Duster 360

shanker said
(cool serpentine setup you've got there :thumbsup: )
then that has me back to being confused about the heater hose routing. On the heater core coming out of the firewall, the pipe is for 1/2" heater cose (driver side) and the one on the passenger side is for 5/8 heater hose. I was going to run the 1/2" to the heater control valve then on to the water pump (closest to the radiator) and the 5/8 hose directly to the intake manifold nipple. am I wrong there?

5/8" to the pump is correct. My 75 Service manual says the 5/8" core nipple is on the Drivers side. But it doesnt matter much really as long as the hose diameters all fit. The control valve just blocks the flow to the core.

The Control valve can block the inlet flow or it can block the outlet flow and its functionally identical.