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Description
850CFM Ultra XP Carburetor - 0-80804HBXOverview: 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)
- Hard Core Gray with black anodized billet aluminum metering block and booster inserts
- 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
- 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 | Hard Core Gray with Black |
| Booster | Down Leg |
| Brand | Holley |
| Carburetor Use | Professional Race |
| CFM | 850 |
| Choke | None |
| Circuit | 2 |
| Condition | New |
| Emission Code | 3 |
| Finish | Hard Core Gray |
| Fuel | Gasoline |
| Fuel Inlet | Dual |
| Marine Use | No |
| Material | Aluminum |
| Model | 4150 |
| Primary Main Jet | 84 |
| Primary Power Valve | 4.5 |
| Primary Pump Nozzle Size | 32 |
| Product Type | Ultra XP Carburetor |
| Secondaries | Mechanical |
| Secondary Main Jet | 84 |
| Secondary Pump Nozzle Size | 32 |
| Supercharged Application | No |
| Throttle Bore | 1.750 inch |
| Venturii Size | 1.563 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
4.2 ★★★★★
Based on 14 reviews
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Product Reviews
★★★★★ 5
Color and quality
Color: Light Brown
Beautiful and wonderfully made just did not work with our color palette
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Reviewed in the United States on April 6, 2026
★★★★★ 5
Todo según lo esperado
Color: Dark Brown
Todo como lo esperado
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Reviewed in the United States on May 28, 2026
★★★★★ 5
Great for blue collar guys
Color: Dark Brown
Perfect size for dumping pockets, phone, knife and keys after work or when switching pants
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Reviewed in the United States on March 3, 2026
★★★★★ 5
Well-built MacBook Stand to Help Eliminate Ergonomic Problems
Color: silver
Like so many people these days, a lot of my life revolves around being on my laptop. Like so many people these days, all that time hunched over a laptop was causing physical discomfort. Once I realized the source of my problems and reading up on solutions to common laptop ergonomics problems, I chose this laptop stand as one of my tools to correct the ergonomics issues facing me, and eight months later I am happy to inform you that this has done its job well.
Fortunately, I was already using my laptop on a standard-height desk, but having the screen at desk height (30" off the floor) was the major source of neck pain for me. At its lowest setting (the knob all the way to the left), it raises my 13-inch MacBook Pro about 5-3/4" off the table (measured to the bottom of the aluminum body that covers the back of the laptop screen). Note that if your MacBook has a different depth (measured from front to back), the amount your screen is raised will be a little different. At the highest setting (knob to the right), the screen is raised about 7-1/2" off the table.
I am just over 6' tall and tend to find that my neck is able to maintain a comfortable neutral position when the knob in the right third of the slide, but of course that varies according to each user, their sitting position, and own comfort zone. All-in-all, this provides a really great range of screen heights that is likely to fit most peoples' needs, especially on 30" height desk.
I think the pictures do a great job of covering aesthetics (that is certainly a big part of this purchase). It is high-quality aluminum, and like all aluminum, it is a fairly soft, scratch-prone metal. Mine has remained in nearly new condition after 8 months, and it maintains a clean look that looks almost looks like an Apple product. If you have one of the newer space gray or colored-aluminum MacBooks, that might obviously be an issue.
Mechanically, the stand is solid. There are no indents or notches in the slide. There is a slight spring to the upper "lever" of the base such that if you have the knob set to the lower positions, the upper part of the base springs upward to the highest position when the laptop is removed. In the highest position, the stand is already at its highest position, and there is no movement. I suspect that the spring is actually to help the upper arm move upward as the knob is slid to higher positions.
One caveat for use of this stand should be used with an external mouse and keyboard. Of course, Apple's Magic line of keyboards, mice, and trackpads work well with this, but the point is that when the laptop is raised, it is no longer comfortable (or ergonomic) to use the laptop's keyboard and trackpad.
Overall, this product delivers in every way I need. The price is on the high side, but I hope it will last through the life of this laptop and at least one replacement or three (and maybe even the days when the laptops become archaic relics of the past). The range of screen lift (about 5-3/4" to 7-1/2") suits me well (and I suspect, will suit a large number of people) and the aesthetics are a great match for MacBook users.
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Reviewed in the United States on October 16, 2017
★★★★★ 5
Very sturdy and sleek looking laptop stand
Color: silver
I was skeptical when I first ordered this. It didn't look very sturdy in the pics, but I was wrong. It is very sleek looking and functional, with the adjustable height. Very modern looking as well and my MacBook Pro fits perfectly on it. Very glad to have purchased this for my home office.
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Reviewed in the United States on March 2, 2024