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The power-valve circuit adds fuel when demand is the greatest. At part-throttle, main jets can be sized for part-throttle economy instead of WOT power. This circuit is most often used only on the primary side of a four-barrel carburetor.
Circuit City

The power-valve circuit adds fuel when demand is the greatest. At part-throttle, main jets can be sized for part-throttle economy instead of WOT power. This circuit is most often used only on the primary side of a four-barrel carburetor.  View Related Article

 

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