No. there's a vacuum port just above one of the butterflies, I've used this to control the emission valve and the vacuum advance. I had used this initially for the petrol tank vent so I don't have a home for that at the moment. Measuring with the strobe light it appears to be working correctly but a rolling road would be a better place to check this.
The beauty of these carbs is there's no need for taking a munch out of the wing.
