The Holley 2300 ALUM ULTRA XP 500 CFM carburetor has been a game-changer for countless racers, helping them clinch victories time and time again! What’s the secret to its success? It’s all about integrating the tried-and-true design elements from the popular Ultra series, enhancing tunability, durability, and features while keeping it lightweight. This impressive 2-barrel carburetor is crafted entirely from aluminum, resulting in nearly 50% weight savings compared to its zinc counterparts.

One standout feature is the contoured venturi inlet, which ensures unobstructed airflow. You’ll appreciate the screw-in air bleeds, making fine-tuning a breeze. The black anodized, fully adjustable billet aluminum metering block and baseplate provide a sleek look and reliable performance. Plus, the high-capacity fuel bowl holds 20% more fuel, helping to prevent starvation during those intense races. With an integrated fuel shelf to minimize aeration and internal baffling to control slosh, you can trust this carburetor to perform under pressure. The centered air cleaner flange also boosts airflow and overall performance.

Other notable features include wedged floats, a knurled hand-adjustable curb idle screw, and down-leg boosters, all designed to enhance your racing experience. The Ultra xP 2-barrel carburetors are approved for use in NASCAR® Mid-West/West Coast Late Model Divisions and maintain the same venturi and throttle bore dimensions as the classic 4412 2-barrel carburetor. With options in shiny or Hard Core Gray finishes, the Ultra xP 2-barrel is ready to outperform any production 2-barrel on the market.

• Instructions for Part# 0-4412BKx
• Ultra xP 2 Barrel Carburetor Product Flyer
• Carburetor Numerical Listing for Part #0-4412BKx

• All aluminum construction for nearly 50% weight savings compared to zinc versions.
• Tumble polished aluminum with a black billet aluminum metering block and base plate.
• No choke tower for unobstructed airflow.
• Air bleeds moved outward for smoother airflow transitions.
• Air cleaner flange centered over the venturi for improved airflow and performance. Comes with a 5/16-18 bent air cleaner stud.
• Down-leg boosters enhance fuel signal.
• Contoured hex head squirter screw for streamlined airflow.
• Internal pump passage on the metering block features tunable bleed off.
• Maintains the same 1-3/8" venturi and 1-11/16" throttle bore size as the original 0-4412.
• The fuel bowl offers 20% more capacity while minimizing slosh with internal baffling.
• Clear sight windows on both sides of the bowl make fuel level adjustments easy and safe.
• The fuel trough in the bowl directs fuel flow straight to the jets, ensuring they stay covered.
• Built-in drain plug allows for easy access to empty the bowl.
• -8 (O-ring) inlet threads provide a variety of plumbing options (includes 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 actuation.
• Throttle shaft capped to keep out debris and contaminants.
• 30cc pump with a metal lever and an anti-siphon valve in the main body to reduce pump pull over.
• Dedicated race-only throttle lever with unnecessary street attachment points removed.
• Knurled (hand adjustable) curb idle screw for easy adjustments without tools.
• Set screw for wide-open throttle stop adjustment.
• Wedge float provides fuel control during cornering.
• 100% wet-flow tested by Holley technicians to ensure it’s ready to run!

• Barrels: 2
• Billet Color: Shiny with Black Billet
• Booster: Down Leg
• CFM: 500
• Choke: None
• Emission Code: 3
• Finish: Shiny
• Fuel: Gasoline
• Fuel Inlet: Dual
• Material: Aluminum
• Model: 2300
• Primary Main Jet: 74
• Primary Power Valve: 3.5
• Primary Pump Nozzle Size: 28
• Product Type: Carburetor
• Secondaries: None
• Supercharged Application: No
• Throttle Bore: 1.688 inch
• Venturi Size: 1.376 inch
• Warranty: Limited 90 Day