Things You'll Need:
- Flathead screwdriver
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Step 1
Start the engine and allow it to reach normal operating temperature. This is necessary to ensure that the carburetor's choke opens fully.
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Step 2
Turn the idle speed screw with a flathead screwdriver until the desired idle speed is reached. The idle speed screw is located on the driver's side of the carburetor. The screw's pointed tip faces the rear of the vehicle. Turning the screw in a clockwise direction increases the idle speed, while turning the screw in a counterclockwise direction reduces the idle speed.
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Step 3
Locate the two idle mixture screws. Both screws are on the front of the carburetor. Note that directly in the center of the carburetor, just underneath the "Edelbrock" logo, is a large port. One idle mixture screw is located on either side of this port.
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Step 4
Adjust both idle mixture screws with a flathead screwdriver. Turning an idle mixture screw in a clockwise direction will richen the air/fuel mixture, while turning the screw in a counterclockwise direction results in a leaner mixture. Turn either of the screws in either direction until the engine's speed reaches the maximum rpm, then turn the other screw until the engine's speed reaches the maximum rpm.
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Step 5
Readjust the idle speed screw first adjusted in Step 2 until the desired idle speed is reached.
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Step 6
Turn each idle mixture screw until the engine's rpm increases to the maximum level to complete the adjustment.
