Editing Carb vacuum port ID (section)
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===Manifold vacuum=== A manifold vacuum source will be there all the time- at idle and when the throttle blades are opened. ====PCV vacuum ports==== [[File:Egr vac qjet.jpg|thumb|400px|left|EGR port on Q-jet from a Pontiac]] The PCV is often connected to the large front vacuum port in the carb throttle body. Its position there allows the crankcase vapors that are pulled from the engine by the PCV system to be shared equally between both primary throttle bores. The primary side is used instead off the secondary because the primary side is almost always flowing a good quantity of air so the vapors will be well mixed before entering the combustion chambers to be burned. <br style="clear:both"/> ====Power brake booster vacuum port==== The large rear vacuum port on the throttle body (often threaded with pipe threads for a female fitting to connect a steel line) is used for the power brakes. Or a vacuum port located on the intake manifold can be used. ====Transmission modulator vacuum port==== If you have an automatic transmission that uses a vacuum modulator, this also uses a manifold vacuum source. Often the factory used a fitting with a restricted orifice that was fitted to the intake manifold for this but you can use a port on the carb.
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