You Can Be a Carb-Tuning Hero
Holley and Demon carbs use a diaphragm-style primary power valve. Theopening point is usually marked on the valve, such as a number like 65.This means that the valve opens (adding more fuel) at 6.5 inches ofmanifold vacuum. Using a lower- number power valve, like a 55 or 45,delays power-valve opening and could improve fuel mileage. View Related Article
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