Buckshot - with all due respect, there is an error in the content of your above post.

While throttle bore diameter has meaning, the airflow is determined NOT by the throttle bore diameter, rather the internal venturi diameter. This error is very wide-spread.

For better understanding, even though this article is a Stromberg single barrel updraft, I think it will add understanding:

Example of different air flow, same throttle bore

If the imitation were a genuine Carter of the same size, the air flow on the primary side would be 250 CFM.

Most Q-Jets prior to 1976 have a primary size of 150 CFM.

I'm too lazy to figure the relative air velocity difference, but it is SIGNIFICANT!

Waveski - you may find an unintended result of higher vacuum!

Jon

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