Thread: 350 SBC 6-71 Blower Carburetor Adjustments

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Manifold vacuum is from the base of the carb or directly off the intake manifold. Ported means it's taken off the cab, above the butterflies, so you only get vacuum above idle.

Originally Posted by firebird77clone

Manifold vacuum is from the base of the carb or directly off the intake manifold. Ported means it's taken off the cab, above the butterflies, so you only get vacuum above idle.

Ah, right. All of the vacuum lines are hooked up below the carburetors, but above the supercharger. The carburetors are boost referenced, to a connection below the supercharger.