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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 |
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- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
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4.8 ★★★★★
Based on 2114 reviews
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Product Reviews
★★★★★ 4
Overall sound thesis worthy of thoughtful consideration
Format: Kindle
Choudary’s book has the tag line, “Who wins when AI restacks the knowledge economy.” While the book is annoying in sections, vague in others, and prone to jargon in yet more locations, the basic thesis is sound and compelling. It’s worth considering.
Choudary’s main argument is that the winners after AI technology is widely adopted will be those who take a systems view of their business rather than simply upgrading individual elements within it. He backs this with several examples based on past technological disruptions and hypothetical case studies. He argues that the best advantages from AI will come from improved communication and managing risk. He supports these arguments reasonably well within the chapters. He also includes 10 Takeaways at the end of each chapter, which is extremely helpful for recapping and making sure the reader understood the thesis.
What gets annoying is Choudary goes back to the same case studies again and again and again. I reached the point of saying, “the horse is dead. Please stop flogging it.” Next, some of his arguments about things like “managing risk” are vague—there’s not enough about specific risks to be useful, which leaves AI as a magic wand to wave. Finally, as with many business writers, Choudary occasionally (but not overwhelmingly) drops into jargon like “technological solutionism.”
Overall, I recommend the book. It’s made me think, even as I struggle to apply the principles to my own business.
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Reviewed in the United States on November 22, 2025
★★★★★ 5
Must read - Insightful and Trusted
Format: Paperback
Reading “Reshuffle” was both intellectually energizing and personally relevant for me. Sangeet Paul Choudary’s work is more than just a business strategy manual, it’s a lucid roadmap for thriving amid constant change.
Having spent the past decade steering our teams through multiple waves of technological disruption, I recognized my own journey in Choudary’s stories of platform transformation. His concepts of “connectors” and “combinators” spoke directly to challenges I’ve faced: breaking down silos, fostering creative recombination of ideas, and unlocking new sources of value in our organization. There were moments while reading when I paused, reflected on recent strategy sessions, and realized how much we could benefit from the frameworks outlined here.
What truly set “Reshuffle” apart for me was Choudary’s ability to tie cutting-edge AI trends to everyday executive decisions. When he wrote about the collision between legacy content pipelines and new generative workflows, it echoed conversations I’ve had with other executives.
“Reshuffle” reminded me that constant evolution isn’t just a necessity, it’s an opportunity to lead with optimism and vision. Choudary’s voice is empathetic, insightful, and refreshingly practical, making the book feel like advice from a trusted colleague as much as a renowned thought leader.
In short, “Reshuffle” is a must-read for anyone tasked with steering a tech company through turbulent times. For me, it has become a personal touchstone for navigating and embracing what’s next.
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Reviewed in the United States on August 20, 2025
★★★★★ 5
Finally, a framework that makes sense of AI's impact on knowledge work
Format: Kindle
Most books about AI focus on task automation and productivity gains. Reshuffle does something different: it explains how AI restructures entire systems through three constraints: tasks, coordination, and risk.
For someone working in the language services industry, this book was revelatory. It helped me understand why so many conversations about AI and translation feel misdirected. We debate whether AI will replace translators when the real question is: how will AI reshuffle who creates value in language services?
Choudary's central insight is that when AI removes old constraints (like scarcity of expertise), value doesn't disappear. It migrates to new coordination and risk management challenges. This applies across all knowledge professions, not just translation.
Section 2 on knowledge work is particularly strong. It shows that lawyers, consultants, accountants, and translators are all experiencing the same fundamental transformation. We're not uniquely vulnerable; we're part of a larger reshuffling of how knowledge creates value.
If you're trying to position yourself or your organization for what's coming, this book offers the clearest framework I've found. It's not about having better AI tools. It's about understanding where value pools are forming in the new system.
Recommended for anyone in knowledge work who wants to move beyond surface-level AI discussions.
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Reviewed in the United States on January 25, 2026
★★★★★ 5
Not like any other how-to book on AI--Eric Swanson's Review
Format: Kindle
Reshuffle is not another “how to use AI” guide. It’s a powerful, big-picture look at how AI is reshaping the very foundations of the knowledge economy. Sangeet doesn’t just explore tools—he reveals the tectonic shifts in how knowledge is created, distributed, and valued. Most people use AI to improve old systems; this book shows why the winners will be those who understand and adapt to entirely new ones. Using powerful examples from history, like the bar code, container boxes and the Maginot Line, Sangeet creates powerful frames for new ways of thinking. Insightful, clear, and compelling, Reshuffle is essential reading for anyone who wants to lead in the age of AI
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Reviewed in the United States on July 23, 2025
★★★★★ 5
Would your card still be in the deck after the AI reshuffle?
Format: Paperback
AI’s impact on knowledge workers, and on enterprises, is immense. “Good enough” and inexpensive answers now abound, and the premium once commanded by knowledge workers seems to be slipping away. Enterprises are pinning their hopes on AI-driven efficiencies to stay competitive and relevant. Emotions surrounding this technological breakthrough range from doom and gloom to glee and hope.
Sangeet’s Reshuffle helps build a mental model to understand, navigate, and survive this change, and even thrive in it. It’s a refreshing departure from the usual first-order effects and fallacies that dominate social and print media.
For knowledge workers, staying relevant is becoming increasingly difficult, especially as the very definition of “relevance” evolves. Simply acquiring AI skills may not suffice if the underlying value of those skills has shifted. Judgment, systems thinking, and coordination will become more valuable. Remaining well-paid and autonomous will require protecting and growing contextual and economic value within this transformed system. Simple, but not easy.
At the enterprise level, applying AI for task-based efficiencies in one area often shifts constraints elsewhere. Using systems thinking and positioning AI as the engine, not merely a tool, for innovation and coordination across the value chain will give enterprises a fighting chance to stay competitive.
While the metaphorical pie may grow, simply “playing the same game better” won’t earn you a proportional share of it. Existing systems will be unbundled and re-bundled into offerings that solve emerging constraints. Coordinating across the value chain and taking responsibility for delivering customer outcomes will be key to unlocking outsized gains.
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Reviewed in the United States on October 29, 2025
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