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First install the new needle-and-seat with gaskets on both sides of the adjusting nuts. Then invert the bowl and adjust the float level by turning the adjustment nut until the float is level. Remember that each bowl screw requires a thin gasket to seal against fuel leaks. Now you can use the screws to install the float bowls.
Rebuild a Holley Carburetor

First install the new needle-and-seat with gaskets on both sides of the adjusting nuts. Then invert the bowl and adjust the float level by turning the adjustment nut until the float is level. Remember that each bowl screw requires a thin gasket to seal against fuel leaks. Now you can use the screws to install the float bowls.  View Related Article

 

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