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How to Adjust & Tune Edelbrock Carburetors

by Carl Pruit

The Edelbrock carburetor is one of the simplest carburetors to adjust. With two adjustment screws in the front of the carburetor, you can adjust and tune the carburetor in just a few minutes and have your engine running smoothly. The optimum setting for the Edelbrock carburetor is to run between 550 and 650 rpm. This will give you more power as well as greater fuel mileage. You can adjust and tune the carburetor yourself with a screwdriver and a vacuum gauge.

Step 1

Place the vehicle's transmission in "Park" and open the hood. Remove the wing nut that holds the air cleaner onto the top of the carburetor and set the air cleaner out of the way.

Step 2

Locate the two adjustment screws on the front of the Edelbrock carburetor, just below the nameplate. Start the engine and let it warm up for a few minutes.

Step 3

Find a starting point to adjust the carburetor by turning the screw on the left side of the carburetor as you are looking from the front of the vehicle, counterclockwise with a screwdriver until it is all the way open. Turn the adjustment screw on the right side with a screwdriver, clockwise, until it is completely closed.

Step 4

Turn the screw on the right side counterclockwise two and one-half full turns and turn the screw on the left side, clockwise, until it is completely closed. Back the screw on the left side off by turning it counterclockwise two and one-half full turns.

Step 5

Remove the rubber vacuum hose from the vacuum port in the front of the carburetor between the two adjustment screws and attach a vacuum gauge to the port. Turning the screws alternately, back and forth by half turns, adjust the screws until both are reading between 550 and 650 rpm on the vacuum gauge.

Take the vacuum gauge off the vacuum port and reattach the rubber vacuum hose. Secure the air cleaner to the top of the carburetor with the wing nut and shut the engine off.

Warning

  • Always be careful of moving engine parts while attempting to adjust and tune the Edelbrock carburetor while the motor is running.

Items you will need

  • Screwdriver
  • Vacuum gauge

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