Torque Production - 10 Torque Tactics
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Most of the air entering a 23-degree Chevy intake port hugs the outside wall and exits through section A of the intake valve, shown in the graphic here. Only about 30 percent of the air enters the cylinder via section B. Because the greatest flow is via section A, there is a strong swirling action. In the case of this port, it's counterclockwise. View Related Article
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