Rochester Quadrajet Carburetor Four Barrel Carburetor Airflow
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Though 20.4 inches is the accepted pressure standard for rating four-barrel carburetor airflow, some aftermarket carburetor manufacturers rate their carburetors at 28 inches. So it is difficult to directly compare flow values without knowing the stated pressure. This HP-series Holley measured 950 cfm at 28 inches and 820 cfm at 20.4 inches. View Related Article
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