SKU: 292745296

500 CFM Ultra XP 2BBL Carburetor - 0-4412HBX

Sale price$414.88 Regular price$460.98
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Description

500 CFM Ultra XP 2BBL Carburetor - 0-4412HBXOverview: 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% weight savings over their zinc counterparts, contoured venturii inlet for unobstructed airflow, screw in air bleeds for

Overview:

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% 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% 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:

  • All aluminum construction - for nearly 50% weight savings over zinc version
  • Hard Core Gray with 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 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” Venturii & 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
  • -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% wet-flow tested by Holley technicians to assure it arrives ready to run!

Application:

Year Make Model Submodel Engine Size
Universal

Specs:

Barrels 2
Billet Color Hard Core Gray with Black
Booster Down Leg
Brand Holley
Carburetor Use Performance and Race
CFM 500
Choke None
Condition New
Emission Code 3
Finish Hard Core Gray
Fuel Gasoline
Fuel Inlet Single
Marine Use No
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
Venturii Size 1.376 inch
Warning California Proposition 65
Warranty Limited 90 Day
Shipping Notes
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
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SKU: 292745296

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Dolores
San Leandro, US
★★★★★ 4
Tv stand
Color: Walnut
It’s really nice. Fits perfectly for my tv. But I should have measured the length. . It is shorter then I thought
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
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Karen
Birmingham, US
★★★★★ 5
Overall very satisfied.
Color: Walnut
The TV stand is very simple to assemble and most people should be able to complete it in a little while, as several steps may require a second person. The unit itself is very sturdy and a little larger than I expected. The sliding "door" does require a little force to move, but furniture wax should do the trick nicely.
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Reviewed in the United States on March 9, 2026
A
Anna Marie
Port Orchard, US
★★★★★ 5
Beautiful quality made tv stand.
Color: Walnut
Beautiful TV stand. Easy to assemble. I took a chance on this stand matching the new end tables I got from a different store and manufacturer. They match perfectly. I couldn't be happier with the color of the wood, the quality construction and minimalist clean look. It looks great in my living room.
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Reviewed in the United States on March 9, 2026
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kawaiikitty
Lake Worth, US
★★★★★ 5
Modern and sleek
Item Package Quantity: 1
I haven't assembled this yet but I'm really looking forward to using it as a nightstand - the style looks really sleek and modern and it seems like it'll fit perfectly in a small space. It's worth noting that it's made of particle board rather than solid wood, which is pretty standard at this price point, so just go in with that expectation. The design looks really clean and the storage shelf underneath is a practical bonus. Hoping it holds up well over time but based on first impressions and the overall look, I think it's going to be a really nice and affordable addition to the bedroom!
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Reviewed in the United States on May 22, 2026
A
Ad Nauseam Pontificator
San Leandro, US
★★★★★ 3
Decent looking but not very sturdy
Item Package Quantity: 1, Item Package Quantity: 1
This table looks pretty nice once it is fully assembled and I appreciated that all the parts were clearly labeled. There were no missing parts, and in fact there were some extras. That made the instructions easier to follow and helped speed things up. From unpacking everything to finishing assembly it took me around 30 minutes. There are a few quality issues though. The black finish feels very thin and started chipping around the screws while I was tightening them down. It does not seem like it will hold up very well over time if it already shows wear during assembly. The biggest issue is the stability. Even after tightening everything, the table still feels a little shaky. The set screws near the bottom base pieces do not stay tight for very long and kept loosening while I was putting it together. I assembled it by myself and the legs kept shifting and falling over because those connections would not stay secure. This is definitely easier if you have another person helping. The packaging also could have been better. The box had a lot of particle board dust and debris inside, so unpacking everything was a bit messy. The item description says it can hold up to 66 pounds, but after putting it together I personally would not trust it with anywhere near that much weight. I originally planned to use it for a small aquarium that weighs around 20 pounds, and even that made me uncomfortable once I saw how flimsy the table felt assembled. I think it is better suited for lightweight items and I'd only store something like a couple of books or a lightweight lamp or a couple of picture frames. Overall it is not terrible and it does look reasonably attractive, but the build quality does not really match the current fifty dollar price in my opinion. It should be priced lower. It works for light decorative use, but I would not expect anything especially sturdy or long lasting.
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Reviewed in the United States on May 26, 2026

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