Flooding

• 1). Check the fuel level sight window on the side of the fuel bowl. If the fuel is above the base of the window, you have a flooding condition and will need to lower the float height.
  
  
• 2). Turn the screw on the top of the bowl out two turns with a screwdriver. Turn the adjustment nut with a wrench, in a clockwise direction, lowering the float. Start the engine and allow it to idle. Continue adjusting the nut until the fuel rests at the base of the window. If the flooding persists, replace the float valve, as described in the next step.
  
  
• 3). Turn the adjustment screw completely out, pulling the nut off with the screw and using a pair of pliers to pull the valve out of its seat. Insert a new valve from a rebuild kit and insert the adjustment screw/nut. Screw the adjustment screw in two turns, start the car and begin the nut adjustment process until the fuel level is reset at the base of the fuel level window.
  
  

Rough Idle

• 1). Attach a vacuum gauge to the available port on the intake manifold. With the engine idling, adjust the metering block idle mix screws (one on each side of the metering block) in half-turns counterclockwise.
  
  
• 2). Read the vacuum gauge until the gauge is not affected by the half turns of both mix screw, indicating the maximum vacuum level has been reached.
  
  
• 3). Pull the vacuum gauge off the intake port and leave the screws at their current setting.
  
  

Sluggish Acceleration

• 1). Feel the carburetor's seams (where the gaskets are visible) for vacuum leaks, indicated by a slight suction. Replace the faulty gasket by unbolting the fuel bowl with a 5/16 wrench, then removing the metering block screws with a screwdriver (if necessary) or the base plate screws, again with a screwdriver. Discard the faulty gasket and scrub away any gaskets pieces stuck to the surface of the carb's seam, using a soft toothbrush.
  
  
• 2). Inspect the jets for blockage and spray compressed air to clear any debris. Remove the power valve from the back of the metering block and insert a new power valve with the same number stamp. With the jets clean and power valve replaced, insert new gaskets on the metering block and base plate, and secure each section's screws to the main body.
  
  
• 3). Slide the bowl gasket and fuel bowl over the metering block and tighten the corner bolts snugly. You may complete this with the carburetor attached to the carb, but if you chose to remove it, place it back on the intake mount and tighten the base ear bolts with a socket wrench. Then, you may test the engine for proper operation and ensure the carb is free from vacuum leaks.