Chevy Camaro Headers, Gears & Posi Upgrade - My Generation Camaro, Part III Photo Gallery
Secondary hangers are critical to achieving the proper air/fuel ratio with a Q-jet. A single letter identifies hangers. The difference between each hanger is 0.005-inch in height. As you can see, the D hanger on the left will pull the metering rods out of the fixed jets much farther than the O hanger on the right. The difference is 11 steps, or 0.055 inch.