The Carter AFB four-barrel carburetor has been among the most popular choices among automotive enthusiasts for decades. Known for its chrome finish, the AFB is also known for its user-friendly adjustment points. Among the most common adjustments are the carburetor’s air/fuel mixture. A mixture which contains too much air will cause the engine to hesitate upon acceleration and potentially destroy the pistons. A mixture which contains too much fuel will decrease the engine’s power. Fortunately, the carburetor need not be disassembled to adjust the mixture.
Turn the engine on and allow it to warm up.
Locate the two large slothead screws at the bottom of the front of the carburetor. These are the air/fuel mixture screws.