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6 The area created by the circumference of the valve diameter and the valve-lift height creates a valve “window” that helps determine airflow. All kinds of variables affect this flow, which is why some heads flow better than others.
Flow Power

 6 The area created by the circumference of the valve diameter and the valve-lift height creates a valve “window” that helps determine airflow. All kinds of variables affect this flow, which is why some heads flow better than others.  View Related Article

 

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