Holley 500 CFM Ultra XP 2BBL Carburetor Hard Core Gray Finish - E85 Fuel Comp

SKU: 1D3N8 | MPN:  0-4412EX

Sale price$1,119.94 USD

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Holley carbs have powered more racers than all others combined and we've just changed the game again. Holley is proud to introduce 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. The new Ultra XP 2bbl carbs for E85 are available in Black Billet Finish


  • 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 squirter 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 0-4412
  • 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
  • -8 (O-ring) inlet threads offer a large variety of plumbing options (come with an extended -8 O-ring to -8AN male adapter and -8 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!



  • Barrels 2
  • Billet Color Hard Core Gray with Black
  • Booster Down Leg
  • CFM 500
  • Choke None
  • Emission Code 3
  • Finish Hard Core Gray
  • Fuel E-85
  • Fuel Inlet Single
  • Material Aluminum
  • Model 2300
  • Primary Main Jet 88
  • Primary Power Valve 3.5
  • Primary Pump Nozzle Size 35
  • Product Type Carburetor
  • Secondaries None
  • Supercharged Application No
  • Throttle Bore 1.688 inch
  • Venturii Size 1.376 inch

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