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Description
4150 ALUM ULTRA XP 750 CFM CIRCLE TRACK - 0-80813BKXOverview: Xtreme Performance Holley Ultra XP Circle Track 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 Hard Core Gray hard coat anodized finish with Black billet for improved corrosion protection & also available in natural tumble polished aluminum with Black metering blocks and base plate. The Aluminum Ultra XP Circle Track
Overview:
Xtreme Performance - Holley Ultra XP™ Circle Track 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 Hard Core Gray™ hard coat anodized finish with Black™ billet for improved corrosion protection & also available in natural tumble-polished aluminum with Black™ metering blocks and base plate. The Aluminum Ultra XP Circle Track carbs are available in 650 & 750 CFM's. Holley Ultra XP carburetors are Specifically Calibrated for Circle Track & offer new features such as anti-siphon valve in the main body; 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, wedge floats, 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
- Calibrated specifically for use on circle track
- Has a set screw in the base plate for wide open throttle stop adjustment
- PTFE coated throttle shafts rides in oil impregnanted bronze bushings for smooth throttle actuation
- Anti-siphon valve in main body to reduce pump pullover
- 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
- -8 (o-ringed) inlet threads offer a large variety of plumbing options and can be plumbed from either side; comes from the factory with 8AN inlet fittings
- 4 corner idle allows you to precisely control your idle system
- Internal pump passage in metering block equipped with a tunable bleed off for further tuning of accelerator pump
- 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
- 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
- Set up with 1:1 throttle actuation
- Baseplate designed with a boss that can be consumer machined for vacuum source
- Includes wedge floats
- 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 | 750 |
| 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 | 78 |
| Primary Power Valve | 6.5 |
| Primary Pump Nozzle Size | 32 |
| Product Type | Ultra XP Carburetor |
| Secondaries | Mechanical |
| Secondary Main Jet | 86 |
| Secondary Pump Nozzle Size | 32 |
| 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
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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]
- Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 15 reviews
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Product Reviews
★★★★★ 3
Cute story about friendship with a fantastical twist.
Format: Kindle, Format: Kindle
Amazon has been recommending me this book for quite some time now, and since I read a lot of reviews saying that the premise was very interesting/ unusual, I decided to give it a shot. I bought the Kindle version.
#1 The artwork: I'm a huge fan of graphic novels, so the art on the cover caught my eye immediately. I liked the overall style, and color palette. However I feel like the interior art falls flat sometimes. No doubt that the artist knows her stuff, but I felt like sometimes she might not have had such a strong handle on the characters. The line thickness tended to vary from panel to panel on some pages, and some characters didn't always look like they belonged in the same universe.
#2: The story (spoilers): The concept for this was very interesting, and I enjoyed it for the most part, but there were some things about the story I thought were unnecessary. I don't think Prince Neptune needed to be a character at all. To me, his only real purpose was to make Danny into a less likable version of herself, and to end the book when he destroyed the school. The ending I also thought was a little weird. I had read reviews about it beforehand, but It still caught me completely off guard. I know the story is fantasy, obviously, but I think it could've been toned down just a smidge. I think if the plot focused more on the relationship between Danny, Madison, and even Danny's other friends, I would've given it five stars. I found myself asking a lot of questions about them in terms of who they were to Danny, and why it seemed like they all stopped hanging out for seemingly no reason. A point was made that Danny had a different schedule than them, but I didn't even see her make an effort to preserve her relationships despite this.
One things I really want to praise the book on however, is the humor. There was a lot of subtle jokes for older readers that I chuckled at, that would probably fly over a kid's head.
For those who are wondering, there's no swearing/ inappropriate words, but some bullying/ teasing/ crying is depicted. There is also fantasy "violence", but it's nothing worse than what you'd see in a Saturday morning cartoon on Disney channel.
#3 Final Thoughts: Overall, I would recommend this book if you have young kids interested in this kind of thing. I'm not the target demographic for this, so I'm a bit more critical, however if someone had put this in the hands of 9 year old me, I would've absolutely loved it to bits.
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Reviewed in the United States on September 10, 2020
★★★★★ 5
Definitely a win for William!
Format: Hardcover
My eight-year-old grandson read this book in a matter of days. He said it was his favorite book of all times and that now he has a favorite new author!
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Reviewed in the United States on January 18, 2026
★★★★★ 5
Recommended by 11 year old boy
Format: Hardcover
My son selected this book to read with his school instructional support as a means to mimic a high cap program. My son likes to read books on this topic, which I find a little depressing and a little dark...but listening to the thought provoking conversations that tutor and student had over ZOOM....this is highly recommended. I did not read the book, but both tutor and student enjoyed reading it. They were a little sad to move to another book. The conversations that I overhead did a wonderful job of providing historical references (which I find lacking in his schooling so far), portraying how the characters FELT, what motivated them, and in general connecting my son to a world far bigger than greater than within our Covid quarantined city. Not sure how much of this wonderful learning experience was based on the talent and experience of the tutor, but ALLIES provided content that was educational, emotional and allowed the tutor to delve deeper, connect ideas, draw inferences and start predicting outcomes. She was trying to teach him to immerse himself in the reading....not just reading for a reading log.
This was a very successful 'book club' for my son.
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Reviewed in the United States on December 16, 2020
★★★★★ 5
Great Read for 11 Year Old
Format: Hardcover
My 11 year old couldn't put this one down and was a bit sad when it ended. We've already ordered another one in the series.
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Reviewed in the United States on January 6, 2026
★★★★★ 5
Be warned! You can’t put this down
Format: Hardcover
Page turner that makes it hard to put down. Loved the history and research and the storyline . My 11 year old grandson introduced me to the series and he reads them to me. Gets us closer
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Reviewed in the United States on April 6, 2026