The "other" port connects to a vacuum tank mounted on passenger inner fender and is a part of the "Delayed Vacuum Break System".
This system delayes choke valve opening a few seconds to allow the manifold to be wetted and prevent stalling due to leanness.
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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