I think they added the holes to pull fumes wich would otherwise gum the blades.
Also, i have found Pontiac changed the throttle body gasket from being vented to a closed gasket at the same time the .028" appeared.
With closed gaskets the fumes did not escape like with the vented gasket and to get the fumes off of the blades holes were drilled in the blades.
With vented gaskets dirt might have entered the venturi, better with holes in the blades? No dirt and still get rid of the fumes!
I donīt think the tiny .028" holes will pull any fuel from the main circuit i the end carbs.
Think about the larger holes in the A/T center carbs, how much fuel wouldnīt those pull? None that iīm aware of.
JMHO
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1966 GTO Tri-Power
1970 GTO TheJudge
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