How much CFM does a stock 5.3 vortec require?

A stock 5.3 Vortec engine typically requires around 600 to 700 cubic feet per minute (CFM) of airflow for optimal performance. This figure can vary slightly depending on the specific model year and modifications made to the engine. It's essential to match the CFM rating of the carburetor or intake system to the engine's airflow needs for efficient operation.