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Holley Ultra XP 2-Barrel Carburetor 500 CFM

Holley 0-4412BKX


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Holley Ultra XP 2-Barrel Carburetor 500 CFM $529.95
Ultra XP 2-Barrel Carburetor
  • 500 CFM
  • Tumble Polished w/Black

  • Specifications:

    Without EGR
    Polished Aluminum
    Manufacturer's Part Number:

    The Holley Ultra XP 2-Barrel Carburetors are the first true Holley 2BBL carburetors designed and constructed specifically for racing applications. They're available in the stealthy appearing Hard Core Gray™ hard coat anodized finish or in natural tumble-polished aluminum with Black™ billet metering block and baseplate for improved corrosion protection. These carburetors are 500 CFM and will comply with the track inspection gages currently used to tech the venturi diameter, throttle bore and throttle-shaft/ butterfly thickness!

    6061-T6 Billet Aluminum Metering Block
  • Improved durability, true gasket sealing (sealing surface integrity), hard coat anodized for good looks and superior corrosion protection
  • Power valve channel restrictors now machined lower in metering block for improved fuel delivery to power valve circuit
  • Accelerator pump channel now internally drilled eliminating need for external plug
  • Excess material removed for improved fuel capacity
  • Integrated pry-point assists in disassembly from fuel bowl and mainbody preventing damage to gaskets and gasket surfaces
  • New snap in place bowl vent whistle makes removal and/or replacement easier

    6061-T6 Billet Aluminum Base Plate
  • Improved durability, true gasket sealing, hard coat anodized for good looks and superior corrosion protection
  • Dedicated race-only throttle lever with all unnecessary street attachment points & tangs removed
  • Knurled (hand adjustable) curb idle screws allow for easy idle adjustment without the use of tools
  • Throttle shaft capped to prevent entry of debris & contaminates

    All-New Fuel Bowl Design
  • Completely redesigned from the ground up for racing
  • 20% more fuel capacity vs. a traditional v-bowl eliminates fuel starvation and provides consistent air/fuel ratios
  • Internal baffling to help control fuel slosh and minimize float level fluctuations in hard launching or cornering situations
  • Fuel shelf below the needle and seat to greatly minimize fuel aeration and promote more consistent metering
  • Fuel trough designed into floor of bowl to route fuel flow directly to the jets and assist in keeping jets covered by fuel
  • Clear Pyrex® sight windows on both sides of bowls for easy and safe fuel level adjustments
  • Built in drain plug in front center of bowl provides easy access to empty contents of bowl
  • Contoured entry provides smooth fuel flow directly to needle & seat
  • -8AN (o-ringed) inlet threads offer a large variety of plumbing options (come standard with -8AN o-ring to -6AN male adapter and -8AN plug). Can be plumbed from either side
  • Material added in key areas (needle & seat area, fuel inlet, sight window area) for added strength in the demanding race environment

    All-New 2BBL Racing Main Body
  • Air bleeds moved outward to allow a smoother transition of airflow from the top of the carburetor into the venturii
  • Slash-cut vent tube
  • Down-leg boosters for improved fuel signal
  • No choke tower for unobstructed airflow
  • All unnecessary mounting bosses removed for a smoother, cleaner appearance with a cast in Holley logo
  • Contoured hex head squirter screws for streamlined airflow
  • 1-3/8'' Venturii and 1-11/16'' Throttle bore size
  • Track gages currently used to tech the venturi diameter, throttle bore and throttle-shaft/ butterfly thickness by race sanctioning bodies can still be utilized

  • All aluminum construction - for nearly 50% weight savings over zinc version
  • Available in Tumble polished aluminum or Hard Core Gray hard coat anodized with Black billet metering block and baseplate
  • Hard coat anodizing on fuel bowls and mainbody - actually penetrates the aluminum for superior corrosion protection

  • Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations