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Originally Posted by Michael C Henry
...There has been some discussion about not having enough vacume to open the secondaries at any achievable RPM with the 600 CFM #1850 carbruetors...
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The air flowing through the primary venturi flows by a hole leading to the secondary diaphragm. The air flowing through the primary venturi pulls vacuum through this hole, opening the secondaries. Engine vacuum has nothing to do with it, just the speed of air through the primaries. You’ve got to have enough speed through both carb venturies in order for the secondaries to open if they’re connected with a hose.
Dan