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Description
950CFM Ultra XP Carburetor - 0-80805BKXOverview: Xtreme Performance Holley Ultra XP carburetors! Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 30 other new features! They're available in our all new Hard Core Gray hard coat anodized finish with Black billet for improved corrosion protection. They're also available in natural tumble polished aluminum with your choice of Black or Red metering blocks and base plate. The
Overview:
Xtreme Performance - Holley Ultra XP™ carburetors! Ultra XP carbs are up to 38% lighter than our traditional race carbs, have fuel capacity that is 20% greater and 30 other new features! They're available in our all-new Hard Core Gray™ hard coat anodized finish with Black™ billet for improved corrosion protection. They're also available in natural tumble-polished aluminum with your choice of Black™ or Red™ metering blocks and base plate. The Aluminum Ultra XP comes in 600, 650, 750, 850, and True 950-CFM. Holley Ultra XP carburetors offer new features such as an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship, high capacity fuel bowls which feature 20% more fuel capacity to eliminate starvation, integrated fuel shelf to minimize fuel aeration and internal baffling to control fuel slosh. Other features include all aluminum construction, fully tunable billet metering blocks, billet base plate, adjustable secondary linkage and knurled (hand adjustable) curb idle screws. Holley Ultra XP carburetors are the ultimate in square bore race carburetors!
Features:
- Aluminum Construction (saves 4.5 lbs - 38% weight savings)
- Shiny with black anodized billet aluminum metering blocks and base plate
- Designed for use on Drag race, circle track, or any high horsepower engines
- Contoured venturri inlet offers balanced airflow for increased horsepower
- Air bleeds moved outward to allow a smoother transition of airflow from the top of the carburetor into the venturii
- Metering blocks feature improved durability, true gasket sealing and fully adjustable (emulsion bleeds, power valve channel restrictors & idle feed restrictors)
- Integrated idle bypass valve eliminates the need for holes in throttle plates and allows for proper adjustment of idle while maintaining correct throttle plate to transfer slot relationship. Helps maintain good idle control when using radical camshafts.
- Dual 30cc accelerator pumps provide the perfect amount of fuel from idle to full throttle
- Fuel bowls provide 20% more fuel capacity while controlling slosh with internal baffling
- Clear sight windows on both sides of bowls for easy and safe fuel level adjustments
- Built in drain plug in front center of bowl provides easy access to empty contents of bowl
- 8AN (o-ringed) inlet threads offer a large variety of plumbing options and can be plumbed from either side
- 4 corner idle allows you to precisely control your idle system
- Mechanical Secondaries for perfect off the line launches
- Elongated (dual pattern) mounting holes allow fitment on intakes with square flange (Holley 4150™ style) or large flange (Holley Dominator® style)
- Knurled (hand adjustable) primary and secondary curb idle screws allow for easy idle adjustment without the use of tools
- Primary throttle shaft capped to prevent entry of debris & contaminates
- Throttle shaft is slabbed and undercut for improved airflow
- Factory machined accessory mounting hole for easy addition of adjustable primary throttle stop. New secondary pump cam lever designed to provide positive throttle stop on secondary side
- Stainless steel adjustable secondary link. Provides choice of 1:1 or progressivesecondary throttle actuation for ultimate control of secondary opening rate
- Baseplate designed with a boss that can be consumer machined for vacuum source
- Includes notched float and jet extensions
- 100% wet-flow tested by Holley technicians to assure it arrives ready to run!
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| Universal |
Specs:
| Barrels | 4 |
|---|---|
| Billet Color | Shiny with Black Billet |
| Booster | Down Leg |
| Brand | Holley |
| Carburetor Use | Professional Race |
| CFM | 950 |
| Choke | None |
| Circuit | 2 |
| Condition | New |
| Emission Code | 3 |
| Finish | Shiny |
| Fuel | Gasoline |
| Fuel Inlet | Dual |
| Marine Use | No |
| Material | Aluminum |
| Model | 4150 |
| Primary Main Jet | 92 |
| Primary Power Valve | 4.5 |
| Primary Pump Nozzle Size | 32 |
| Product Type | Ultra XP Carburetor |
| Secondaries | Mechanical |
| Secondary Main Jet | 92 |
| Secondary Pump Nozzle Size | 32 |
| Supercharged Application | No |
| Throttle Bore | 1.750 inch |
| Venturii Size | 1.600 inch |
| Warning | California Proposition 65 |
| Warranty | Limited 90 Day |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
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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]
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4.1 ★★★★★
Based on 21 reviews
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Product Reviews
★★★★★ 5
This is a must read for ALL writers, not just fiction writers!
Format: Paperback
This is a must read for ALL writers, not just fiction writers! Although, in places, a bit technical, for any writer, not just new writers, for anyone who wants to master their craft, this is a must read book.
What can be said about Gardner that hasn't been said yet? One of the best books on writing about writing that I have read. Comparable to Stephen King's, On Writing. Yes, it is that good. In Part I Gardner lays out a compelling treatise about the genre of fiction, what it is and why it is important. In Part II he discusses the how-to of writing good fiction, where he talks about common errors, technique and plotting at length. One of the benefits from reading The Art of Fiction is that it gives the reader a crash course in literature, who many of us that come from a Science, Technical, Engineering and Math (STEM) background are sorely lacking in. This said a writer who has grown up in the sciences, or engineering, or business worlds will find this book very useful in "catching up" a bit to our friends who have read all of classics and can retell significant scenes as though they were there. Again, this is a must (must) read for ALL writers, not just fiction writers.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 6, 2017
★★★★★ 4
Helpful
Format: Hardcover
The book itself is excellent, very helpful with lots of specific information.
I was disappointed (one star) that the used hardcover edition I ordered arrived as the paperback edition, though in very good condition.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 11, 2025
★★★★★ 5
Good!
Format: Paperback
Needed this for a class but still keep it around as its useful to my field of study.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 19, 2026
★★★★★ 5
Simply what any serious would-be writer must know.
Format: Kindle
I am a writer only in the sense that I write daily and believe that I do have that ineffable "it"; I do not, however, have any formal writing training. I say all of this to make clear that anyone, literally, can read and understand this book, gaining invaluable knowledge about the craft of writing. Some of the less effulgent reviews of this title have pointed to the "pompousness" of Prof. Gardner and his supposed sesquipedalian loquaciousness as reasons for hopeful writers to search-out more simplistic guides.
I disagree emphatically. I truly believe that this book holds the keys to unlocking the divide between the good and great writer, particularly for those of us who have not had access to the best educational opportunities. Personally, I want to be a great writer. Not a good writer, not a successful, or published, or wealthy writer: a great writer. I want to move people to think about things in ways that they never would have, maybe without even knowing that their ideals are changing; I want to move people!
To write like that one needs, me thinks, the guidance of one with an intimate knowledge of how this is properly -and not so properly- done, and the "arrogance" to believe he can convey this understanding, even to we ignoramuses. This is what I have found in Prof. Gardner and this wonderful tome.
Distracters may feel free to criticize my review as they wish. I stand by my opinion of this book and its Author.
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Reviewed in the United States on January 5, 2013
★★★★★ 3
I Recommend It, But Not Much
Format: Paperback
This book is recommended in SELF-EDITING FOR THE FICTION WRITER, a book I have read twice and enjoyed a great deal. I had to give Gardner a try.
This is a tough review to write because I can't say this is a fantastic book to help one write fiction. At the same time, there is little or nothing said that I disagree with. So, what's the problem?
My confusion starts with my expectations when reading a book about writing. It's a situation where I want to gain information and hints on how to write better, without being bombarded by direction on how to write. This criteria has served me well and I've found a number of writing books that made me write or want to write better; SELF-EDITION FOR THE FICTION WRITER is one, THE FICTION WRITER'S WORKSHOP is another.
Judging by that, this book didn't pass muster. Rather than coming away with a new awareness of what I want to include or exclude from my own work, I'm left feeling like I've been having coffee with an experienced author full of sweeping opinions on craft.
He's crafty in one way, his ability to pull me in with the sense of being an insider, watching other fiction writers through thick glass. He uses a lot of lines like "The writer who can't distinguish truth from a peanut-butter sandwich can never write good fiction. What he affirms, we deny, throwing away his book in indignation..." The implication isn't about writers of bad fiction so much as it is about 'us', him and I, being partnered in our unique ability to indignantly recognize a lousy writer. In fact, we're pretty decent to only discard the book when we're entitled to exact creative justice on its sloppy author.
Still, and here's the rub, it isn't a bad read. Don't skip an hour of writing to sit down with this book but if you're between projects and have the time, I'd recommend it.
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Reviewed in the United States on July 11, 2010
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