Valve Angle - Make More Horsepower
Stock valves often have a ditch or undercut just behind the 45-degree seat that can disrupt flow. The stock Ford 351W 1.840-inch intake valve that we tested suffered from this condition. By adding a 30-degree back cut to this valve, we generated a phenomenal 25 percent increase in flow at 0.200-inch valve lift. View Related Article
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