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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
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 25 reviews
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Product Reviews
★★★★★ 5
The new amp/speaker configuration made a very noticeably positive difference.
Size: Pair, Size: Pair
I bought a Denton amp / Klipsch 7 speaker bundle for Christmas last year. It sounded impressive. For this year, I recently replace the Denon AVR-S970H, a 5.2.2 POS-Amp that quit after less than a year. Then I also added a 70” TV and a set of R-51M’s on the sides. I could never hear this amp driving the Dolby Atmos speakers on top of the R-625FA towers, so I decided that back speakers would be more beneficial to this 7-channel system. I’d been using the R-41M’s that came in the bundle as side surround speakers, but I was thinking that they would be more suited for use in back. So I replaced them with a new set of R-51M’s that I thought would be better surround sides because of their fuller stronger sound. As of now, at the front of this theater system is an Onkyo TX-RZ 820 AVR amp, a 70 inch LED 4K smart TV, a set of Klipsch R-625FA towers, an R-52C Center Channel Speaker, and two R-12SW Subwoofers. For the surround sides is the newly purchased set of R-51M’s on stands, and mounted on the back-wall is the set of R-41M’s, using BS-218pro Wall Mounts. For good reason, this is a very powerful amp driving a complete set of purely Klipsch speakers. I built this THX 7.2.0 surround sound system to go in my wife’s 11’ X 12’ privacy room, specifically because she is hard of hearing. She said, that with the new additions, the sound is much cleaner, stronger, the 3D surround effect is more noticeable, and the vocals are easier for her to understand. I get to use it sometimes when she’s not at home. Thunder in movies sounds as crisp sharp and loud as real thunder. All around, the system is very realistic sounding. And it can play music, shaking the house at live levels. At present, my wife and I are extremely happy with this system. It sounds as good as it looks. The Klipsch speakers & Onkyo amp configuration makes a very noticeably positive difference.
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Reviewed in the United States on January 5, 2026
★★★★★ 5
Quality shrink tubing.
Size: 4.8mm (3/16") - 26Ft, Color: Black
This seems to be solid quality shrink tubing, shrinks well, and holds firmly. I have used it for a few projects so far and am happy with how it has performed. The package is larger than I expected, but keeps the tubing from being damaged from bends/kinks.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 7, 2026
★★★★★ 5
Amazing shrinking polymer technology= my growing review.
Size: 12.7mm (1/2") - 13Ft, Color: Black, Size: 12.7mm (1/2") - 13Ft, Color: Black
I recently tried out the TKDMR Heat Shrink Tubing, and it has proven to be a game-changer in my cable management endeavors! As an OCD handyman who values organization and neatness, I was on the lookout for a reliable solution to streamline my cable/wire setups, and this product exceeded my expectations in everyway.
*Ease of shrink (5/5):*
One of the best features of the heat shrink tubing is its ease of application. The tubing is remarkably pliable, easy to cut and straightforward to work with. The simple process involves sliding the tubing over the cable and applying heat, whether from a heat gun, lighter or even a hairdryer! The tubing quickly shrinks snugly around the cable, providing a tight and professional-looking finish. Even for those new to DIY cable management, the learning curve is minimal.
*Versatility (5/5):*
I was pleasantly surprised by the versatility of this heat shrink tubing. It accommodated various cable sizes and shapes, making it a versatile solution for a range of applications. Whether dealing with computer cables, audio cords, electrical box wiring or even small electronic components, the tubing adapted to the different sizes seamlessly. The only slight drawback is that extreme size differences between cables might require different tubing sizes for an optimal fit, This tubing is rather large, but shrinks very small when done carefully. I have fixed many action figures and dinosaurs' broken arms to the delight of my son!
*Durability (5/5):*
Once applied, the heat shrink tubing forms a durable and resilient layer around the cables. It provides an added layer of thick protection against water, wear/tear, etc. safeguarding cables from potential damage due to friction, bending, or exposure. This durability is incredibly beneficial for long-term use and in environments where cables may be subject to constant movement or handling. Especially useful for reinforcing phone charging cords! I'm looking at you cheap apple cords.
*Looks (5/5):*
Beyond its practical usage, TKDMR Heat Shrink Tubing significantly enhances the aesthetics of cable management. The tubing creates a sleek and uniform appearance, concealing multiple cables into a tidy bundle. The matte finish looks professional and modern, elevating the overall visual appeal of any setup. It's a small detail that makes a big difference, especially for those who value a clean and organized workspace, or computer cable management!
*Value for your hard earned Money (5/5):*
Considering the improvement it brings to cable management and the quality of the product, this Heat Shrink Tubing offers excellent value for money. The quantity provided in each package is generous, ( a little goes a long way) and the overall durability ensures that one application will last for years. While the initial cost may be slightly higher than alternative cable management solutions like zip ties etc., the long-term protection benefits make it a worthwhile investment.
*Overall Impressions:*
TKDMR Heat Shrink Tubing has proven to be a highly effective and reliable solution for many purposes. Its ease of shrink, versatility, durability, and aesthetic enhancements make it a awesome product in the market. Whether you're a tech enthusiast, DIY enthusiast, or just someone looking to tidy up your living or working space, this heat shrink tubing is a must-have! Not to mention the satisfying process of shrinking tubes onto wires.
I recommend this heat shrink tubing to anyone seeking a practical and visually pleasing solution for cable organization/wiring maintenance!
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Reviewed in the United States on December 8, 2023
★★★★★ 5
Works as advertised!
Great product, great price well worth the price!
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Reviewed in the United States on February 6, 2026
★★★★★ 4
Heat shrink tubing
Size: 8mm (5/16") - 26Ft, Color: Black
Good product , average price
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Reviewed in the United States on March 25, 2026