To adjust the float level on Holley needle-and-seats, first remove the sight plug in the primary float bowl.

Float level is checked two ways—at the float elements themselves and at the secondary float needle valve. The correct float level adjustment can be found in your carburetor kit instructions ...

* Fuel (Float) Level Adjustment Holley includes a pair of clear plugs for the fuel level sight windows that allow you to see right in the fuel bowl.