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Yes, the vacuum source on Pontiac Tripowers for the distributor was off the center carb, not the front one. It was, however, manifold vacuum from the center carb base on stickshift cars and ported vacuum from the center carb on automatic cars. Power brakes and vacuum linkage for the carbs used the front carb base as a manifold vacuum source. This same port (since the front carb on Pontiac setups is placed in the rear on '66 Olds setups) is used by Olds for manifold vacuum operated heater controls. None of these setups used ported vacuum from end carbs.
My question was related to the '66 Olds setup. Do all the '66 Olds Tri-Carb setups use ported vacuum for distributor advance---or just the automatic ones?
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