Editing Carb vacuum port ID (section)
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===EGR vacuum=== The EGR port will not have as much vacuum at idle as a manifold port- but it will have enough vacuum to register on the gauge, unlike a ported vacuum port that will show less or no vacuum at idle (unless the primaries are open too far due to a low vacuum cam, or from bad adjustments). Because of where the EGR port picks up its vacuum signal (from the venturi as opposed to just above or just below the throttle blades), an EGR vacuum port may tend to show more vacuum on the gauge as the engine speed/throttle angle increases. Another way to ID the EGR port is to blow smoke or carb cleaner spray (or WD-40, etc. if the carb is apart and can be easily cleaned) through the vacuum ports until you find the one that has the discharge coming from an orifice that's in the venturi area of the carb.
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