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The Edelbrock 1406 is a four-barrel "Performer Series" carburetor fitted with an electric choke. Although Edelbrock carburetors are designed to work right out of the box, variations in temperature and altitude can affect the carburetors performance. To compensate for these variables, even a new 1406 should be tuned up. Fortunately, doing so is a fairly straightforward process and no disassembly is required.
Step 1
Locate the two air/fuel mixture screws and the idle speed screw, also known as the air screw. Note that three metal ports extend from the front of the carburetor, just below the "Edelbrock" emblem. On each side of the middle port is a standard screw. These two screws are the air/fuel mixture screws. The idle speed screw is a standard screw located on the front of the bottom of the throttle linkage. The throttle linkage is located on the drivers side of the carburetor.
Step 2
Start the engine and allow it to warm.
Step 3
Adjust the idle speed screw until the desired idle speed is reached, as noted by the vehicles tachometer. Consult the vehicles specifications manual if the speed will be set to the engines stock setting. Turn the screw in a clockwise direction with a standard screwdriver to increase the engine speed, and in a counterclockwise direction to decrease the engine speed.
Step 4
Turn one of the air/fuel mixture screws in either direction with a standard screwdriver only until the maximum engine speed is reached.
Step 5
Lower the engines idle speed to the desired level by turning the idle speed screw in a counterclockwise direction if the idle speed has increased by more than 40 RPM.
Step 6
Turn the remaining air/fuel mixture screw in either direction only until the maximum engine speed is reached.
Step 7
Lower the engines idle speed to the desired level by turning the idle speed screw in a counterclockwise direction.
Step 8
Adjust each air/fuel mixture screw in small increments until the highest idle speed is reached.
Step 9
Turn both air/fuel mixture screws in a counterclockwise direction in small, identical increments until the idle speed decreases by 20 RPM.
Lower the engines idle speed to the desired level by turning the idle speed screw in a counterclockwise direction.
Items you will need
- Standard screwdriver
- Vehicles specifications manual
