MOTORCRAFT 4350 4-Barrel: Overhaul: Carburetor: Notes

The fuel metering system maintains a direct relationship between fuel flow through main jets (metering and vacuum piston rod height) and throttle plate position. This relationship is preset at factory and SHOULD NOT be altered. To maintain this relationship during carburetor overhaul, proceed as follows:

1. Place fast idle speed screw on top step of fast idle cam. Scribe a line on pump operating lever and air horn. This line will be used as a reassembly reference. DO NOT use lines already scribed on lever and housing, they are for manufacturing reference only.
2. Remove throttle link-to-vacuum piston limiter lever by removing nylon adjusting nut. Place carburetor on stand to prevent throttle plate damage.