Hi,
All of the 1969 dual snorkle air cleaners that I have seen have two vacuum motors.
One on each snorkle. A 1969 also has a temp vacuum switch on the underside to cause the vacuum motors to open once the engine gets hot.
Mike
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1968 Pontiac GTO 462CID, 4-Speed Manual, 3.55 rear. Aleutian Blue exterior, 219 Teal Blue interior. Chrome bumper, AM & 8-Track and Rally II Wheels
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