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Install a new power valve in the primary metering block. Holley again makes it easy to install the metering-block gasket since the pins (arrows) allow the gasket to install only one way. Install the idle-mixture screws in the metering block. Adjust them to 11/2 turns out from full idle.
Rebuild a Holley Carburetor

 Install a new power valve in the primary metering block. Holley again makes it easy to install the metering-block gasket since the pins (arrows) allow the gasket to install only one way. Install the idle-mixture screws in the metering block. Adjust them to 11/2 turns out from full idle.  View Related Article

 

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