Holley 0-4412BKX Ultra XP 2BBL Carburetor 500 CFM 2300 Shiny Gasoline

The original Holley 0-4412 has powered thousands of racers to the winners' circle! How do you make it better?

Add the proven design elements of the popular Ultra series for more tunability, more durability, more weight savings and more features! The Ultra Xp 2bbl carburetors feature all aluminum construction for nearly 50 percent weight savings over their zinc counterparts, contoured venturii inlet for unobstructed airflow, screw in air bleeds for easy fine tuning, black anodized fully adjustable billet aluminum metering block and baseplate, high capacity fuel bowl which features 20 percent more fuel capacity to eliminate starvation, integrated fuel shelf to minimize fuel aeration and internal baffling to control fuel slosh and a centered air cleaner flange for improved airflow and performance.

Other notable features include wedged floats, knurled hand adjustable curb idle screw and down leg boosters. Ultra Xp 2bbl carburetors are approved for use in Nascar Mid-West/West Coast Late Model Divisions and utilize the same venturii and throttle bore dimensions of the classic 4412 2bbl carburetor.

Available in shiny or Hard Core Gray finishes, the Ultra Xp 2bbl will outperform any production 2bbl available.

Features and Benefits:

• All aluminum construction - for nearly 50 percent weight savings over zinc version Tumble polished aluminum with BlackTM 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 venturii 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 inch Venturii & 1-11/16 inch Throttle Bore size and Throttle Plate/Throttle Shaft size of original 0-4412 Fuel bowl provides 20 percent 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 -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 Throttle shaft rides in oil impregnated sintered bronze bushings for smooth throttle actuation Throttle shaft capped to prevent entry of debris & contaminates 30cc pump with metal lever
• Anti-siphon valve in mainbody to reduce pump pull over 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 percent wet-flow tested by Holley technicians to assure it arrives ready to run!

Details:

• Barrel Quantity: 2.0
• Billet Color: Shiny with Black Billet
• Body Color: Polished
• Body Finish: Polished
• Booster: Downleg
• Booster Design: Downleg
• CFM: 500.0
• Carburetor Material: Aluminum
• Carburetor Use: Performance and Race
• Condition: New
• Cubic Feet Per Minute Rating: 500.0
• Finish: Shiny
• Flange Type: 2300 2-Bbl
• Fuel Type: Gasoline
• Fuel Inlet: Dual
• Grade Type: Performance
• Linkage Attached: Yes
• Marine Approved: No
• Marine Use: No
• Material: Aluminum
• Model: 2300
• Mounting Hole Quantity: 4.0
• Primary Jet Diameter: 74.0
• Primary Main Jet: 74.0
• Primary Power Valve: 3.5
• Primary Pump Nozzle Size: 28.0
• Spacer Included: No
• Supercharged Application: No
• Throttle Bore: 1.688 inch
• Venturii Size: 1.376 inch
• Warranty: Manufacturer's Limited 90 Day Warranty

Installation Guide: Download PDF

Installation / Product Video: Watch on YouTube

⚠️ California Proposition 65 Warning
California Residents: This product can expose you to chemicals which are known to the State of California to cause cancer or other reproductive harm. Please visit www.p65warnings.ca.gov for more information.