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IFRs are the Idle Fuel Restrictors. One for each barrel. They meter the fuel to the idle screws.


Not quite, They meter fuel to the transission slots.
The transission slots are the discharge ports for the intermediate circuit.





Some Holley four barrel carbs have seperate idle and transfer circuits and they have seperate air bleeds. Its not the same as the intermediate circuit on the Dominators.
Funny how Holley will run seperate circuits on some models. Ron