850 CFM Mighty Demon Carburetor

Mechanical secondaries Calibrated for general competition use

PART# 5563010GC

Suggested Retail: $746.95
Your Price: $671.95
Free Shipping on orders over $100*


The Mighty Demon™ is perhaps the best value for the dollar in the carburetor market today. It is available in a full range of sizes and directly replaces Holley® HP models. It features billet–aluminum metering blocks, billet aluminum baseplates, large capacity fuel bowls complete with patented sight glasses and patented, streamlined air entries. Some of these features are found only on modified carburetors costing much more, and several are available only on Demon Carburetors. These innovative ideas allow the new Mighty Demons to produce more power and achieve higher levels of performance than conventional designs. All Mighty Demon™ carburetors come with a "General Competition" tuneup, but can be easily modified using BG Fuel Systems carburetor service and tuning parts. For high output street engines and for race engines, the Mighty Demon™ delivers the best performance value for the dollar!


  • Clear Dichromate finish for good looks and corrosion protection
  • Designed for well-prepared 408 - 540 cid engines
  • Contoured venturii inlet offers balanced airflow for increased horsepower
  • Mechanical secondaries for awesome tire turning performance
  • Dual accelerator pumps for additional fuel under initial acceleration
  • Screw in air bleeds for precision tuning capabilities
  • Screw in idle feed restrictors for precise idle tunability
  • Billet Metering Blocks for exceptional fuel metering capacity
  • 4 corner idle allows you to precisely control your idle system
  • Billet Baseplate with Idle-Eze™ allows precision fine tuning of the idle speed resulting in a smoother transition from off-idle
  • Large capacity float bowls eliminates fuel starvation
  • Large glass float-level sight windows for easy and safe fuel level adjustments
  • Dual feed fuel inlets for constant high volume fuel delivery
  • “Quik Release” non-stick gaskets for easy jet changes


BoosterDown Leg
Emission Code3
FinishClear Dichromate
Fuel InletDual
Product TypeCarburetor
Supercharged ApplicationNo
Throttle Bore1.750 inch
Vacuum Ports1 timed (spark) port, 1 full, and 1 PCV port
Venturii Size1.560 inch
WarningCalifornia Proposition 65

Tech Resources


This part is legal for use on Uncontrolled (Non-Emissions Controlled) Vehicles or Racing Vehicles.

The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles:

  • 1965 and older U.S. manufactured California Certified vehicles
  • 1967 and older U.S. manufactured Federally Certified vehicles
  • 1967 and older Foreign manufactured vehicle

Racing Vehicles are vehicles that are used exclusively for racing or other forms of competition that are not registered and that may never be used on the street.

WARNING FOR 5563010GC: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

*Free Shipping & Handling only offered to the continental US on orders over $100.

Some parts are not legal for use in California or other states with similar regulations.