I also use the vented gaskets in all but 1964-66 Pontiac end carbs.
The latest factory info calls for the closed 7015345 gasket to these.
I canīt imagine the small .030" holes in the throttle valves will pull fuel from the float chamber in any amounts or at all.
My conclusion on the holes is that they are there to pull any excess of fuel vapor residue for combustion to preven varnish build up on throttle valve edges, where other carbs with the vented gasket vents the vapors to the atmosphere.
FWIW
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
Last edited by Kenth; 02-05-2023 at 07:21 AM.
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