New for 2010, the Professional Series is Circle-Track Exclusive. Built tough to withstand the rigours of round-track racing, these carburetors will take whatever is thrown at them and ask for more. Engine builders will appreciate the tuneability while drivers enjoy the smooth throttle response. With several sizes and variations there is sure to be a carburetor listed that will help make the checkered flag a reality.
| Part # | Description |
| P-750-CT | Circle Track, Gasoline |
| P-750-CTA | Circle Track, Alcohol |
| P-750-ANCT | Circle Track, Annular Boosters |
| Part # | Description |
| P-850-CT | Circle Track, Gasoline |
| P-850-CTA | Circle Track, Alcohol |
| P-850-ANCT | Circle Track, Annular Boosters |
| Part # | Description |
| P-950-CT | Circle Track, Gasoline |
| P-950-CTA | Circle Track, Alcohol |
| Part # | Description |
| P-1050-3CT | Circle Track, 3 Circuit Calibration |
| P-1050-3ANCT | Circle Track, 3 Circuit, Annular Boosters |
High-Flow Aluminium Main Body
The Precision vacuum-drawn aluminium die casting helps to minimise any chance for porosity to occur. Also, critical casting dimensions can be held at much closer tolerances. Larger CFM sizes are die cast to exacting specifications to provide "Real World" venturi/throttle bore combinations that provide both maximum airflow and throttle response.
Screw-in air bleeds enable fine tuning of both the low- and high-speed systems. Scalloped, polished symmetrical throttle bore openings coupled with recessed air bleed cavities provide minimal restriction to airflow, upgraded "Racing" booster venturi provide expanded opening range.
Billet Metering Block
CNC machined to provide more precise fuel metering and a more uniform fuel performance curve. These P-Series carburetor metering blocks feature 5-stage changeable emulsion, idle feed and power valve channel restrictions. This provides the ultimate, tuneable fuel curve. Alcohol carburetors use 4-stage emulsion metering blocks.
Super Duty Throttle Bodies
Designed for competition, these die-cast throttle bodies are CNC machined to exacting specifications and will comply with all the sanctioning association rules. Strengthening ribs reinforce the typical weak areas; thicker cross-sections ensure excellent sealing to the main body. Reinforced positive throttle stops eliminate throttle shaft "over-centring" and reduces load on the throttle shaft at wide-open-throttle. Mechanical secondary carburetors feature a "Quick Link" system that alters the secondary opening rate by simply changing the secondary link. 40%, 60% and 1:1 rates are available. All 1 3/4" throttle bore carburetors (850CFM and larger) will have dual flange capacity.
Die Cast Aluminium Fuel Bowls
With a half-pound less weight than zinc, the P-series carburetor fuel bowl is made from a special marine-grade aluminium alloy for superior corrosion resistance. An increased length enables them to carry additional fuel capacity for high-horsepower race engines. Internal baffles prevent an unstable float level due to fuel slosh. FUEL CHUTE design significantly reduces aeration and helps direct fuel to the bottom of the bowl, towards the main jet pickup area. QFT Professional series bowls have multiple patents, reference utility patent #6554258. All QFT Professional series carburetors come equipped with A/N fittings, #6 A/N for Gas, #8 A/N for Alcohol.