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Most of the Rochester carbs were factory rated at 750 cfm; but this was a airflow rating only; unlike performance carbs that are flowed with a air and fuel mix. When the factory Rochester carb is wet flowed like a Holley carb, the flow rating of the carb is adjusted to around 470-500cfm. I hope this helps you. Mark

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โˆ™ 2005-11-27 02:59:53
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Q: What is the cfm rating on a stock carburetor on a 1986 gmc sierra pickup with a 305?
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