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At an idle, with the air cleaner off, probably the carb.  As rpm increases, switches over to the fan, JMO  Used to be a fairly commo  practice to flip the lids on the air cleaner ( paper filters ) to get the sound of massive amounts of air rushing into the carb, especially when the 4 bbl opened.  Maybe added a couple of horsepower.  Who knows, had to be better than trying to dray all the air through those little snorkels that were on all the factory air cleaners.

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