edwina mojo
New member
On a 1963 Pontiac intake the heater hose return nozzle, is there a valve on the inside of this metal nozzle or should it flow free if the intake is removed from the heads as well as the thermostat. I try to blow through it and can not. 389 4 barrel intake. Also it looks like it will screw off. Is this a bad idea on an intake this old?