The Stage 2 incorporates all of the Stage 1 features plus a recalibrated idle, off-idle, main, accelerator pump, and high-speed circuits to match any engine modifications, such as intake manifold, headers, ignition, or mild cam change. Features include improved idle qualities, instant throttle response, and maximum torque and horsepower for street/strip and tow vehicles with modified engines.
The Stage 3 Quadrajet is intended for serious street/strip and race applications such as circle track and NHRA stock and super-stock classes. This level uses an oversized 0.149-inch needle and seat assembly, and is the start to this fully modified race system. Main well size is increased and balanced to ensure proper top-end, high-rpm fuel flow. Extensive circuit modifications are done to keep the fuel curve correct throughout the rpm range and to obtain clean idle quality and instant throttle response for consistent race-winning performance.
The primary throttle bores...
The primary throttle bores on our Q-jet were worn and the source of a sticky throttle situation and engine vacuum leak. This is common on older carburetors.
Every removable part was disassembled...
Every removable part was disassembled and carefully inventoried before being sent out to be replated in the factory color.
The Q-jet's fuel-filter fitting...
The Q-jet's fuel-filter fitting threads were worn. Consequently, the fitting leaked fuel onto the intake manifold. To repair this, it'll have to be tapped and rethreaded with a special Helicoil. The previous JB Weld repair (below the fitting) will be ground off and resealed.
The carburetor's base plate...
The carburetor's base plate is trued flat on this spinning disc.
Before the throttle shafts...
Before the throttle shafts were reassembled, new bushings were installed and fitted.
Underneath the carburetor's...
Underneath the carburetor's base plate, these two plugs had been repaired. Since then, the metal (near the repair) had begun to break off and cause small leaks. This area will also be ground down and resealed. Next, all the parts will be chemically cleaned and sent out together for replating. Plan ahead, because replating an existing core typically takes a few weeks.