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Paperboy Paperboy is offline
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Join Date: Nov 2013
Location: Torquay , UK
Posts: 66
Garage
The vacuum port is part of the oil tank ventilation. If I remember the 964 has two vacuum leads from the oil tank, one thicker that connects to the intake after the air flow meter but before the throttle body, a second thinner one that connects right after the throttle body which I think is the one your are missing. My guess is if everthing else is ok the car should idle ok if you just try plugging it. If not the other lead might be missing / not connected as well.You would need to check the oil tank vent setup on your 71 so all is ok for driving with the 964 engine. I guess ideally compare diagrams for both cars.
Old 09-13-2018, 11:14 AM
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