Disconnect the throttle linkage and vacuum lines from the carburetor. The throttle linkage is on the driver's side of the carburetor and attaches to the carburetor with a single clip. Pull the clip off of the linkage arm with a pair of pliers, then slide the linkage away from the carburetor to disconnect it. At least one rubber vacuum line is attached to the base of the carburetor.
Some models have more than one vacuum line depending on which accessories the engine is equipped with. Pull each vacuum line off of the carburetor. Disconnect the fuel line from the carburetor. The fuel line attaches to the front of the stock carburetor with a single nut. Loosen the nut with a wrench, then pull the fuel line away from the carburetor to disconnect it.
Remove each of the four nuts which attach the carburetor to the top of the engine with a wrench, then lift the carburetor off of the engine. A single nut is located at each corner of the bottom of the carburetor.
Lift the carburetor gasket away from the top of the engine after the carburetor is removed. Performance 2 Barrels.
Performance and Race. Professional Race. Quick Fuel. Specialty Carburetors. Street Warrior and Classic Holley. Ultra XP. Carburetor Use. Items 1 - of Items. Shut the engine off. Install a vacuum gauge to a full manifold vacuum port. Turn the screws all the way in until lightly seated. Next, back them out 1 full turn and restart the engine making sure the choke is completely off. Be sure you keep all 2 or 4 screws even. You can also do these adjustments without a vacuum gauge.
The adjustments are the same except you will adjust to highest engine RPM at idle. To properly size a power valve, take a vacuum reading at idle and if it is above 12" for a standard transmission a 6.
For automatic transmissions take a vacuum reading in gear at idle and if the vacuum is below 12" divide that in half for proper size. Example 9" of vacuum in gear at idle will require a 4. After I shut my car off and come back out the next morning there is gas on the throttle shaft and puddled on the intake.
What causes this? This is usually caused by percolation. This is when the engine is shut off and the engine temperature rises it causes the fuel to boil in the bowl and leak out of the boosters.
There are a couple of things you can do to resolve this situation. One is make sure the fuel level is not too high. The heat from the engine will rise into the carburetor at times and will cause the fuel to boil. Installing a phenolic heat spacer between the carburetor and the intake or a heat shield can cure this.
These parts will prevent heat from getting to the carburetor and boiling the fuel. To adjust the fuel level you will need to take out the sight plug on the side of the fuel bowl. With the vehicle running loosen the lock screw on top of the fuel bowl and turn the nut clockwise to lower the level or counter clockwise to bring up the level.
You want it to be at the bottom of the sight hole. If you turned it too far down it might bend the tang on the float. If you bent the tang on the float, you'll need to get back to a good starting point. This will get you back to a starting place.
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