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Holley 0-4412HBX Ultra XP 2300 2BBL Carburetor

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#42504412HBX

Holley 0-4412HBX Ultra XP 2300 2BBL Carburetor

All-aluminum construction for nearly 50% weight savings over the zinc version
Hard Core Gray with Black billet aluminum metering block and base plate
Same 1-3/8 inch venturii and 1-11/16 inch throttle bore as the original 0-4412

Finish:

E-Coated Hard Core Gray

$828.95

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Factory Shipped

$921.95

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Product Summary

2-Barrel Carburetor Barrels, Gasoline Fuel Type, Black

All-aluminum construction for nearly 50% weight savings over the zinc version
Hard Core Gray with Black billet aluminum metering block and base plate
Same 1-3/8 inch venturii and 1-11/16 inch throttle bore as the original 0-4412
No choke tower for unobstructed airflow
Air bleeds moved outward for a smoother transition of airflow into the venturii

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Key Specs

Carburetor Barrels	2-Barrel
Fuel Type	Gasoline
Choke Type	No Choke
CFM Range	500-599 CFM
CFM	500 CFM

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Holley 0-4412HBX Details

The Holley Ultra XP 2BBL Carburetor (0-4412HBX) is a 500 CFM race-ready evolution of the legendary Holley 4412 two-barrel that has powered thousands of racers to the winner's circle. All-aluminum construction delivers nearly 50% weight savings over the original zinc version. The Ultra XP 2BBL uses the same 1-3/8 inch venturii and 1-11/16 inch throttle bore dimensions as the classic 4412 and is approved for use in NASCAR Mid-West/West Coast Late Model Divisions. Finished in Hard Core Gray hard-coat anodize with Black billet aluminum metering block and base plate.
Features:
All-aluminum construction for nearly 50% weight savings over the zinc version
Hard Core Gray with Black billet aluminum metering block and base plate
Same 1-3/8 inch venturii and 1-11/16 inch throttle bore as the original 0-4412
No choke tower for unobstructed airflow
Air bleeds moved outward for a smoother transition of airflow into the venturii
Down-leg boosters for improved fuel signal
Air cleaner flange centered over the venturii for improved airflow
5/16-18 bent air cleaner stud included
Screw-in air bleeds for easy fine tuning
Fully adjustable billet aluminum metering block (emulsion bleeds, power valve channel restrictors, idle feed restrictors)
Fuel bowl provides 20% more fuel capacity with internal baffling to control slosh
Clear sight windows on both sides of the bowl for easy fuel level adjustment
Built-in drain plug for easy bowl draining
-8AN O-ring inlet threads (extended -8 O-ring to -8AN male adapter and -8 plug included)
30cc accelerator pump with anti-siphon valve in the main body to reduce pump pull-over
Wedge floats, knurled hand-adjustable curb idle screw
Approved for NASCAR Mid-West/West Coast Late Model Divisions

Specs

Barrel Quantity: 2
Barrels: 2
Billet Color: Hard Core Gray with Black
Body Color: Hard Coat Gray
Body Finish: E-Coated
Body Material: Aluminum
Booster: Downleg
Booster Design: Downleg
Brand: Holley
Carburetor Material: Aluminum
Carburetor Use: Performance and Race
Category: Air and Fuel Delivery
CFM Rating: 500
Choke: None
Choke Type: None
Color: Hard Coat Gray
Condition: New
Cubic Feet Per Minute Rating: 500
Emission Code: 3
Finish: Hard Core Gray
Flange Shape: Rectangular
Flange Type: 2300 2-BBL
Fuel: Gasoline
Fuel Inlet: Single
Fuel Type: Gasoline
Grade Type: Performance
Linkage Attached: Yes
Marine Approved: No
Material: Aluminum
Model: 2300
Mounting Hole Quantity: 4
Part Type: Carburetor
Primary Jet Diameter: 74
Primary Main Jet Size: 74
Primary Power Valve: 3.5
Primary Pump Nozzle Size: 28
Product Type: Carburetor
Secondary Barrel Type: None
Spacer Included: No
Sub Category: Carburetion
Supercharger Compatible: No
Throttle Bore Diameter: 1.688 inch
Venturii Size: 1.376 inch
Warning: California Proposition 65
Warranty: Manufacturer's Limited 90 Day Warranty

Rebates

Holley October Promo 10% Off Select Parts Sale

Holley's October Promo 10% Off Select Parts Sale, running from September 28, 2026, through November 1, 2026. For a limited time, customers can save up to 10% off on select Holley parts, making it the perfect opportunity to upgrade your ride with premium Holley branded parts including Holley, Brawler, Quick Fuel, Leg Wheels, Rev Wheels, Rocket Racing, Flowtech, Edge, Racequip, Apr and Dinan. Purchases must be made between September 28, 2026, through November 1, 2026. This limited-time offer applies to qualifying Holley branded parts purchased during the promotional period. Following the promotion, these parts will revert back to standard pricing.

Guides & Documents

Carburetors Installation Instructions (42504412HBX)

CA Prop 65

CARB warning

Holley 0-4412HBX Specifications

KEY SPECS
MFG. Part #	0-4412HBX
Brand	Holley
Carburetor Barrels	2-Barrel
Fuel Type	Gasoline
Choke Type	No Choke
CFM Range	500-599 CFM
CFM	500 CFM
Carburetor Flange Type	2-Barrel 4-Bolt
Finish	Anodized
Material Type	Aluminum
Color	Black
Secondary Type	None
Fuel Inlet Type	Dual
Gasket(s) Included	No
New or Remanufactured	New
Throttle Linkage Type	Universal
Supercharged Application	No

GENERAL
Model	2300
Overall Height	3.25 Inch
Inside Diameter	1.376 Inch venturi
Inlet Fitting	-8 AN O-ring inlet threads with -8 O-ring to -8AN male adapter
Booster	Downleg
Throttle Bore	1.68
Venturi Diameter	1.376 Inch
Vacuum Ports	Timed spark port and full manifold vacuum port
Primary Power Valve	3.5
Primary Pump Nozzle Size	28
Primary Jet Size	74
GTIN Code	090127713365
Sold in Quantity	Each

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