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The problem you run into using the vacuum advance port on the aftermarket carbs is that it is designed as a vacuum signal, not as a calibrated flow. Typically it is ported to one primary bore only. The purge function is basically a calibrated vacuum leak, needs to be distributed evenly between...

The ¼” purge line on a three nipple canister is not connected to straight manifold vacuum. That port on the Thermoquad is a timed port, vacuum present only at part to full throttle, split evenly between the two primary bores as the purge function is a metered flow.