Quick Fuel Technology SUPER STREET SERIES CARBURETORS - Manual (Page 4)

5. With the float level verified and correct, rotate the throttle to wide open twice. If the temperature is below 72 degrees,
the choke will close and the accelerator pump nozzles should discharge fuel. You can now start the engine.
6. It should not be necessary to continue operating the throttle while attempting to start the engine. If it does not start on
the first attempt, rotate the throttle a couple of additional times, then try starting the engine again. The engine should
start.
7. If the engine still will not start, try holding the throttle open slightly while starting in the event to much fuel entered the
engine while operating the throttle or the idle speed might be too low for your application.
8. Once the engine has started, the fast idle cam should raise the idle speed, however, if the fast idle is still too low then
you can adjust the idle speed screw behind the primary throttle lever. The engine should idle between 1,600 and
2,000 RPM. Let it idle at this speed for approximately 5 minutes. The choke should open on its own during this time
and be fully open (vertical position) after approximately 3 minutes (will vary with outside temperature).
9. After the engine has reached operating temperature and the choke has reached the open vertical position, rotate the
throttle open slightly, the idle speed should drop down between 700 and 1,000 RPM. If you had to adjust the idle
speed screw then turn it counter-clockwise to reduce the idle speed to the desired RPM.
10. If possible using a manifold vacuum gage, set the idle mixture screws to attain the highest manifold vacuum reading
at idle. It is not necessary to keep all four mixture screws at exactly the same number of turns from seated, but they
should be close to the same number of turns. Make adjustments in small increments of ¼ turn per adjustment. See
how the engine responds then adjust the mixture screws to smooth out the idle. Turning in one mixture screw could
not have any noticeable effect, if the other three mixture screws are out too far. The mixture screws should be
adjusted in conjunction with each other to achieve the proper mixture. When engineʼs RPM increases during the
adjustment process, adjust it back down to the desired rpm and continue mixture screw adjustment until the engine
RPM or vacuum drops. When the engine RPM or vacuum drop, the idle mixture is too lean and the mixture screws
will need to be backed out to the highest vacuum or RPM.
11. Turning the mixture screws in (clockwise) leans the mixture, turning the mixture screws out (counter-clockwise)
richens the mixture.
12. After you have attained the highest manifold vacuum (or best idle quality), with an automatic transmission apply the
brake then shift the transmission into gear. This will create a load on the engine and may change the idle
characteristics. With performance camshafts with longer duration it is often necessary to add a little more fuel
because the engine is not as efficient and therefore must be over fueled slightly to keep the engine from laboring
when a load is placed on the engine such as shifting the transmission into gear.
13. You are now ready to drive the vehicle. It may require some minor adjustments with the mixture screws and idle
speed but the engine should drive smoothly and have good throttle response.
14. Once you are satisfied with the general drivability then take the car out on the highway to determine how well the
engine runs while holding a steady RPM. Generally any RPM above 2,000 RPM the carburetor is operating off the
main metering system. The air fuel ratio in this system is usually controlled by the main metering jets. If the engine
surges while driving at a steady RPM on flat ground then the mixture is probably too lean and the main jets need to
be increased in size. If the engine labors and has difficulty holding a steady speed without opening the throttle more,
then the mixture is probably too rich. Ultimately, you should look at the spark plug color after 75 to 100 miles to help
determine the general air/fuel mixture the carburetor is delivering and the engine is operating. White plug color
indicates a lean mixture, dark gray or black indicates a rich mixture.
This carburetor has been calibrated to operate on a broad cross-section of engine combinations. While it is not
possible for a single calibration to work virtually every conceivable application it should work on most engines and it
will not be necessary to make any additional adjustments and/or tuning. Should it be necessary to alter the fuel
curve in our Hot Rod Series there is plenty of tuning capability available with changeable air bleeds, power valve
channel restrictions, and idle feed restrictions.
Raise or Lower Float with a 5/8” wrench
Set fuel level in middle of window with engine
running at idle speed with proper fuel pressure
(note the arrows in the casting)
DO NOT ADJUST WITH ENGINE RUNNING