For example, a cylinder-head port that flows 275 cfm at 28 inches of water by itself and 206 cfm with the intake manifold and carburetor installed is experiencing a flow loss of 25 percent.

A cylinder head with killer intake numbers but poor exhaust flow is not going to perform as well as a head with a slightly weaker intake but an excellent exhaust port.

The intricacies of airflow dynamics through a cylinder head are some of the most difficult concepts to grasp in all of hot rodding. That made it the perfect top ...