PROFORM® High-Flow Main Body - The precision vacuum-drawn die casting helps to minimize any chance for porosity to occur. Also, critical casting dimensions can be held at much closer tolerances. Larger CFM sizes are secondary hard tool machined to exacting specifications to provide "real world" venturi / throttle bore combinations that provide both maximum air flow and throttle response. Screw-in air bleeds enable fine tuning of both the low- and high-speed systems. Scalloped, symmetrical throttle bore openings provide minimal restriction to air flow, upgraded "racing" booster venturi provide expanded operating range. Billet Metering Blocks - CNC machined to provide more precise fuel metering and a more uniformfuel performance curve. These P-Series carburetor metering blocks feature changeable emulsion and idle feed restrictions. This provides the ultimate, tuneable fuel curve. They are used in gasoline and alcohol carburetors, including 3-circuit carburetors. Super Duty Throttle Bodies - Designed for competition, these throttle bodies are CNC- machined to exacting specifications and will comply with all sanctioning association rules. Strengthening ribs reinforce the typical weak areas; thicker cross sections ensure excellent sealing to the main body. Together, these features reduce the potential for warpage and ensure smooth throttleoperation. Reinforced positive throttle stops eliminate throttle shaft "overcentering" and reduces load on the throttle shaft at wide-open-throttle. P-Series carburetor throttle bodies are available in either standard or 4500 flanges. Die Cast Aluminum Fuel Bowls - a half-pound less weight than zinc, the P-Series carburetor fuel bowl is made from a special marine-grade aluminum 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 pick up area. Professional Series bowls have multiple patents, reference utility patent # 6554258.Pit Stop USA offers Quick Fuel Technology Professional Series 850CFM Circle Track Carburetor - Gasoline P-850-CT at low everyday prices. Be sure to check out all of our products from Quick Fuel Technology including Quick Fuel Technology 800+ CFM Gasoline Carbs.