1974 Chevy Camaro Quadrajet Rebuild - Special Q

With the air-horn gasket in place (remember to carefully fit it over the protruding top of the power piston assembly), the accelerator pump can be set into place and the lid put back on.

The air-door tension must then be properly adjusted. If it's too tight, the door won't open under load and the engine will strain. If it's too loose and the door opens too quickly--you guessed it, Quadrabog! If you feel some light-to-moderate resistance when pushing the door open, the adjustment should be about right.

At this point, our man drops in the secondary-metering-rod assembly using a stock "G" hanger, which he thought was rich but left alone...

...and DA metering rods, which Murphy said would help give our impending powerplant a healthy midrange.

Speaking of tuning ... Murphy laid out, from top to bottom, a small variety of jets, primary metering rods, power piston springs, and secondary metering rods...

...In this shot, we've got just a few of the many available secondary-metering-rod holders. The variety of rod shapes and sizes is mind-boggling, and the combinations nearly endless.