OEM Hitachi Carb & Vacuum lines in B210 Posted 7 minutes ago · Report reply Vacuum advance port should be just above the throttle plate when closed at idle. There should be no vacuum advance at idle. However as the throttle opens the plate rises up to and above the port and intake vacuum is felt. As the plate opens farther the intake vacuum begins dropping and at WOT there is almost none at the port. That said, the vacuum port is above the throttle plate but the outlet pipe might be anywhere. Someone who has one would know.