Skip to main content
ASK OUR EXPERTS
1-866-464-6553

850 CFM Mighty Demon Carburetor

Limited to Stock Calibrated for blow-through applications

Part # MAD-850-BT Be the first to write a review

850 CFM Mighty Demon Carburetor

Not Available

3

Emissions

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

See Emissions Details
Holley is proud to announce that the next generation of Mighty Demon™ carburetors have arrived. They are available in a full range of sizes and options for your street/strip car. They feature billet-aluminum metering blocks, billet aluminum baseplates, large capacity fuel bowls complete with dual sight glasses, dual threaded inlets on each side, and internal baffling to prevent fuel slosh when you are on the track. For high horsepower street and race engines, the aluminum Mighty Demon™ delivers more power and performance for your race car. Limited to Stock

Features:

  • Clear Dichromate finish for good looks and corrosion protection
  • Designed for well-prepared 425 - 540 cid engines
  • Calibrated to work with turbocharged and centrifically supercharged applications
  • 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

About Demon

Get classic modular performance when you shop for Demon carburetors at Holley.com. We offer numerous models for countless applications.

Barrels4
BoosterAnnular
Brand Demon
Carburetor UsePerformance and Race
CFM850
ChokeNone
ConditionNew
Emission Code3
FinishClear Dichromate
FuelGasoline
Fuel InletDual
Marine UseNo
MaterialAluminum
ModelMighty Demon
Product TypeMighty Demon
SecondariesMechanical
Supercharged ApplicationYes
Throttle Bore1.750 inch
Vacuum Ports1 timed (spark) port, 1 full, and 1 PCV port
Venturii Size1.560 inch
WarrantyLimited 90 Day
UPC792898400993
Part NumberMAD-850-BT
3

This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) 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


WARNING: It is against the law to install this part on an Emissions Controlled Vehicle


The following vehicles are considered Emissions Controlled Vehicles:

  • 1966 and newer U.S. manufactured California Certified vehicles
  • 1968 and newer U.S. manufactured Federally Certified vehicles
  • 1968 and newer Foreign manufactured vehicle
This model of carburetor has the square bore flange bolt pattern. It can replace Holley, Edelbrock, Carter AFB, and Autolite style carburetors with 5 3/16" x 5 5/8" bolt pattern. If you have a spreadbore style intake manifold, you will need an adapter to install this carburetor. Similar to the Mr. Gasket #1932.
Limited 90 Day: See Details
Reviews

    Your Review

    *Free Shipping & Handling only offered to the contiguous US on orders over $149, excludes clearance parts and oversized packages.

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