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Quick Fuel Q-850

Quick Fuel Q-Series 850cfm Drag Race Carb

793-Q-850

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$772.95
Quick Fuel Q-Series 850cfm Drag Race Carb $772.95
QTY
Q-Series 850cfm Drag Race Carb

Specifications:

Finish
Tumble polished
Barrel
Four
CFM
850
Choke
None
Quantity
Sold individually
Carburetor Flange
Square bore
Ford Kickdown
No
Fuel
Gasoline
Secondary Type
Mechanical
New Or Remanufactured
New
Throttle Linkage Type
Universal
Booster Type
Down-leg
Primary Jet Size
76
Primary Power Valve (Hg)
4.5 Hg
Secondary Jet Size
84
Primary Inner Air Bleed Sizes Included
33
Secondary Inner Air Bleed Sizes Included
33
Secondary Outer Air Bleed Sizes Included
70
Primary Outer Air Bleed Sizes Included
70
Secondary Power Valve
Plug
Manufacturer's Part Number:
Q-750-BAN


Performance & Value

Main Body
  • All aluminum (upgrade from existing designs)
  • Tumbled finish for a high luster that protects against contaminants
  • Recessed air bleeds out of air stream to improve airflow
  • Raised accelerator pump squirter nozzle boss also out of air stream to reduce the possibility of high-speed pullover or "dribbling"

    Metering Blocks
  • CNC-machined from solid aluminum
  • 4 stages of emulsion help break up solid fuel for leaner air/fuel sooner & excellent throttle response
  • Stainless steel idle mixture screw with a superior nylon seal that won't deteriorate over time like cork
  • Machined internal passages (vs. die-cast cored holes) ensure consistent performance and almost no chance of porosity holes cross-talking between passages
  • 4-corner idle system for fine-tuning even with extremely long duration camshafts

    Throttle Body
  • CNC-machined from solid aluminum for a more stable platform than die-cast equivalent
  • PTFE-coated throttle shafts with PTFE ribbon bearings reduce rotational resistance and nearly eliminate the use of the throttle body shaft hole as a bushing (great protection in dirt environments)
  • Mechanical secondary carbs have the Quick Link Secondary Opening System that enables rate adjustment simply by changing links (available opening rates: 40%, 60%, 1:1)
  • Mechanical secondary carbs also have adjustable secondary airflow cam brackets that allow better idle tuning with race-oriented camshaft profiles

    Fuel Bowls
  • Die-cast aluminum for cooler fuel resulting in fewer fuel percolation problems
  • Sight glass to monitor fuel level without risking fuel spillage
  • All standard service replacement parts accepted
  • Floats based on application, i.e. Drag Race Carbs have notched floats & secondary jet extensions

    Vacuum Secondary Carburetors
  • Exclusive billet secondary housing cover
  • Cover has an integrated screw that allows timing & opening rate adjustments with just a simple turn
  • Adjustable housing offers much finer tuning to dial-in application



    Q-Series Mechanical Secondary Carburetor Kits include:
  • Quick Fuel Q-Series Drag Race Carb (650, 750, 850, 950, or 1050 cfm)
  • JEGS Dual Inlet Fuel Line Kit #555-100822
  • JEGS Fuel Pressure Gauge 15 psi #555-41010

  • my 406 chevy has a 850 on it but it will idle sometimes and sometimes it dies adjusted the carb it will run fine foe about 5 mins and then it wont idle,could it be a power valve,or could it be dirt in one of the metering blocks just wondering were to turn

    Asked by: skipper72
    Please call our tech line for assistance 1-800-345-4545 ext 2001
    Answered by: Rusty B
    Date published: 2018-06-29

    Are the gasket kits interchangeable with all the models?? Which gasket kit fits the 850, and where available?

    Asked by: 74 Pantera
    This kit fits most of the 4150 series carburetors - Part Number: 793-3-210QFT
    Answered by: Rusty B
    Date published: 2017-09-22
    • y_2018, m_10, d_18, h_4CST
    • bvseo_bulk, prod_bvqa, vn_bulk_2.0.8
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