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Now that we had fuel pressure, we could make some jetting changes. The beauty of the Quadrajet is that secondary jetting changes can be accomplished very easily. Remove one small screw and pull the secondary hanger and you have instant access to the metering rods. If you search around the junkyard, you can accumulate quite a collection of Q-jet secondary metering rods for next to nothing.
My Generation Camaro, Part II - 1987 Chevy Camaro

Now that we had fuel pressure, we could make some jetting changes. The beauty of the Quadrajet is that secondary jetting changes can be accomplished very easily. Remove one small screw and pull the secondary hanger and you have instant access to the metering rods. If you search around the junkyard, you can accumulate quite a collection of Q-jet secondary metering rods for next to nothing.  View Related Article