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Holley 0-4412EX

Ultra XP E85 Aluminum Carburetor 2-Barrel

Holley 0-4412EX


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Holley 0-4412EX Ultra XP E85 Aluminum Carburetor 2-Barrel $633.95
Ultra XP E85 Aluminum Carburetor
  • 2-Barrel
  • 500 cfm
  • Hard Core Gray Finish

  • Holley 0-4412EX Details

    500 cfm

    Holley carbs have powered more racers than all others combined and they have just changed the game again. Holley has introduced the all new Ultra XP 2 Barrel. Holley 2 barrels have been a mainstay in oval track racing for decades, but racers always want more. They want more tuning ability, more durability, more weight savings and more features, so Holley listened and designed the all new Ultra XP 2bbl. Delivering the proven results of the Ultra XP 4bbl but now in a 500 CFM 2bbl and E85 Fuel Compatible. It's all aluminum so it provides nearly 50% weight savings. It has no choke tower and an all new air entry area for smoother air flow, yet it retains the critical venturi and throttle bore dimensions for rule racing. It has large capacity XP fuel bowl, wedged float, dedicated race-only throttle lever, billet metering block & base plate, plus much more.

  • E85 Fuel Compatible
  • All aluminum construction - for nearly 50% weight savings over zinc version
  • Black billet aluminum metering block and base plate
  • No choke tower for unobstructed airflow
  • Air bleeds moved outward to allow a smoother transition of airflow
  • Air cleaner flange centered over venturi for improved airflow and performance. 5/16-18 bent air cleaner stud included
  • Down-leg boosters for improved fuel signal
  • Contoured hex head fuel squirt screw for streamlined airflow
  • Internal pump passage on metering block equipped with tunable bleed off
  • Same 1-3/8'' venturi & 1-11/16'' Throttle Bore size and Throttle Plate/Throttle Shaft size of original Holley 2-bbl 0-4412 carburetor
  • Fuel bowl provides 20% more fuel capacity while controlling slosh with internal baffling
  • Clear sight windows on both sides of bowl for easy & safe fuel level adjustments
  • Fuel trough designed into floor of bowl to route fuel flow directly to the jets and assists in keeping jets covered by fuel
  • Built in drain plug provides easy access to empty contents of bowl
  • Throttle shaft rides in oil impregnated sintered bronze bushings for smooth throttle actuation
  • Throttle shaft capped to prevent entry of debris & contaminates
  • 50cc pump with metal lever. Anti-siphon valve in main body to reduce pump pull over
  • -08AN (O-ring) inlet threads offer a large variety of plumbing options (come with an extended -08AN O-ring to -08AN male adapter and -08AN plug). Can be plumbed from either side
  • Dedicated race-only throttle lever with all unnecessary street attachment points & tangs removed
  • Knurled (hand adjustable) curb idle screw allows for easy idle adjustment without the use of tools
  • Set screw for wide open throttle stop adjustment
  • Wedge float provides fuel control while cornering
  • 100% wet-flow tested by Holley technicians to assure it arrives ready to run!

  • Specifications:

    Without EGR
    Hard Core Gray
    Manufacturer's Part Number:

    Holley Ultra XP E85 Aluminum Carburetors incorporate 30 new features! Specifically designed and calibrated for E85 fuel in drag race or circle track applications, these carbs are anodized Hard Core Gray with black accents.

  • Compatible with E85 fuel
  • Available cfm: 500, 600, 650, 750, 850, 950
  • 38% lighter because 97% aluminum construction
  • Anodized Hard Core Gray with black billet accents
  • Premium finish protects against ethanol's corrosive properties
  • 20% more fuel capacity compared to standard V-bowl
  • and 100% Holley

    Updated Main Body
  • Cast Holley logo for easy identification by race officials
  • Contoured hex head squirter screws for streamlined airflow
  • All unnecessary mounting bosses removed for a cleaner appearance
  • Air bleeds moved outward for smoother airflow transition from the top of the carburetor into the venturii
  • Idle bypass valve eliminates the need for throttle plate holes, allows proper idle adjustment, and maintains idle control with radical camshafts

    All-New Fuel Bowl Design
  • Completely redesigned for racing
  • Longer fuel line required due to increased bowl length
  • Built-in drain plug (front center) for easy access to empty bowl
  • Contoured entry flows fuel smoothly and directly to needle & seat
  • Clear Pyrex sight windows (both sides) for safe, simple fuel level adjustment
  • Greater fuel capacity prevents fuel starvation and provides consistent air/fuel ratio
  • Fuel trough in the bowl "floor" routes fuel directly to the jets and helps keep jets submerged
  • Fuel shelf below needle & seat minimizes fuel aeration and promotes more consistent metering
  • Material added to needle & seat area, fuel inlet, and sight window area to enhance strength for racing
  • Internal baffling controls fuel slosh and reduces float level fluctuation during hard launches and cornering
  • -8AN O-ring inlet threads offer many plumbing options from either side (standard with -8AN O-ring to -6AN male adapter and -8AN plug)

    6061-T6 Billet Aluminum Baseplate
  • Boss can be machined for vacuum source
  • Primary throttle shaft capped to keep out debris/contaminants
  • True gasket sealing, superior corrosion protection, and improved durability
  • Factory-machined accessory mounting hole for easy addition of adjustable throttle stop
  • Knurled primary and secondary curb idle screws allow idle adjustment by hand without tools
  • Dedicated race-only throttle lever (all unnecessary street attachment points & tangs removed)
  • Elongated, dual pattern mounting holes accommodate intakes with square flange (Holley 4150) or large flange (Holley Dominator)
  • Stainless steel secondary link offers choice of 1:1 or progressive secondary throttle actuation for ultimate control of secondary opening rate
  • Throttle body & secondary pump cam lever provide positive throttle stop on secondary side for a reliable 90° opening/return of throttle plates

    6061-T6 Billet Aluminum Metering Blocks
  • Excess material removed for greater fuel capacity
  • Snap-in-place bowl vent whistle simplifies removal/replacement
  • True gasket sealing, superior corrosion protection, and improved durability
  • Accelerator pump channel internally drilled to eliminate need for external plug
  • Pry-point assists in disassembly from fuel bowl and main body to prevent gasket damage
  • Fully adjustable (emulsion bleeds, power valve channel restrictors, and idle feed restrictors)
  • Power valve channel restrictors machined lower in metering block for better fuel delivery to power valve circuit

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