Chevy Carburetor Tuning Tips - Dial In Your Carb
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Situated on the primary side of the metering block, the purpose of the power valve on a Holley carb is to provide additional fuel flow under heavy load. It opens at a preset vacuum level and enriches the air/fuel mixture by 7-10 jet sizes. This allows crisp throttle response and preserves gas mileage at low-rpm and load, and provides necessary fuel enrichment on the primary side under heavy throttle. View Related Article
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