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Description
4150 ALUM ULTRA XP 650 CFM CIRCLE TRACK - 0-80812BKXOverview: 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 | 650 |
| 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 | 74 |
| Primary Power Valve | 6.5 |
| Primary Pump Nozzle Size | 32 |
| Product Type | Ultra XP Carburetor |
| Secondaries | Mechanical |
| Secondary Main Jet | 82 |
| Secondary Pump Nozzle Size | 31 |
| Supercharged Application | No |
| Throttle Bore | 1.688 inch |
| Venturii Size | 1.250 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
4.5 ★★★★★
Based on 7 reviews
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Product Reviews
★★★★★ 4
Looks fine at a glance but definitely budget
Color: Ivory, Size: Large
I picked this up in the ivory color and the overall design leans very old school, especially with the oversized front buttons. They look nice from a distance, but up close they feel a bit cheap. The pants are one of the better parts, with a comfortable fit and an elastic waistband, and the included tie is a nice touch. Fit seems generally accurate, though having a size chart would have helped. The material is where the cost really shows, with a coarse polyester exterior and a smoother inner lining that helps with comfort. It gets the job done if you need something affordable in a pinch, just don’t expect it to feel or look high end up close.
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Reviewed in the United States on March 19, 2026
★★★★★ 5
Great looking suit
This suit is very good looking. To me, it is hard to find a suit in a cream color like this, that actually looks good. This one pulled off the trick for me!
The jacket is well made and if you look at the posted photos you will see that the hankie pocket is slightly slanted. That makes this suit a bit unique among others. It even comes with the Red Tie included!
It is well made, great looking, fits right and feels great.
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Reviewed in the United States on April 19, 2026
★★★★★ 1
Too Wide and Not Long Enough for Tall, Skinny Builds
I bought this for my 16-year-old son (he’s about 6’2” and very tall and slender with a normal pant size of 30" 34") to have something simple in his closet for school dances and occasional events. Gray felt versatile — something he could dress up or down without overthinking it.
Sizing was the biggest issue for us. I ordered a men’s large because that’s typically what I buy him for sweat pants, work out pants and for the added length in shirts, but this suit was way too big through the waist and chest. For something labeled “slim fit,” it did not fit like a slim suit at all. The inseam measured at 31 inches, which is shorter than other suits we’ve purchased for him, and the size chart (which wasn’t available when I ordered) doesn’t even list inseam measurements at all — which really matters for tall, lean boys like mine.
As far as construction, this feels more like an occasional-wear suit for a teenager than something a grown man would wear regularly. The jacket is lined, which is nice, and it includes extra buttons. But there were loose threads inside around the buttons and pockets, and some stitching — especially under the arm pit area it already looked like it could come apart with wear. The inside pocket material feels thin and not especially durable. The arm length itself was a great fit for my tall son, and even offered a little room for growth.
The pants were similar. When I turned them inside out, I noticed loose threads where the seams meet, particularly at the crotch. The pocket lining material feels rough, and there is only 1 extra inch of fabric at the hem if you need additional length, where I am used to seeing 2 inches of material for adjustments. I noticed that my son wore his belt on his hips when he tried it on so he pant legs would look more of a normal length.
Overall, this might work fine as a backup suit for someone who needs it once in a while and isn’t overly concerned with tailoring or long-term durability. But based on fit and construction, it’s not something I would purchase for my husband or for frequent wear.
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Reviewed in the United States on February 18, 2026
★★★★★ 2
I dislike the royal blue - I abhor the cheap, tacky buttons
I requested this product without being able to see the product photo or any information about it (beyond the title) because I requested a similarly-priced 3-piece suit on Amazon previously and that was a fine suit; it wasn't amazing, but it was decent. This is far worse and I don't think many people would feel good about spending the $75 on this.
I would never wear this suit jacket in public because it would embarrass me due to the color and the buttons. I suppose the color is a subjective choice, and I like many shades of blue and have two blue suits. A dark blue would've been OK with me (preferable), or even a lighter blue could be OK I suppose - but this "royal blue" shade is nauseating to me, its as if its trying to be overly-vibrant.
The buttons aren't just a problem because they're cheap plastic - their placement is reminiscent of a style of suit jackets I've only ever seen in history books or old period movies set in eras well over a century ago - nobody wears jackets like this anymore unless they're dressed in formal uniforms like police. The title says it could be for a prom? No, I would not ever wear it to a prom or suggest it as a suit anyone would wear to a prom.
The pants are decent! This is why I'm giving it two stars. Initially I couldn't imagine wearing this suit in any way whatsoever but the pants fit well and have a very professional-looking crease right where it should be. The color is bad, but I'll keep it in the back of the closet for days when I have no other slacks appropriate for work that are clean. I greatly appreciate the elastic in the waistband - it has that new stretchy type which allowed me to fit into it without trouble even though someone of my weight otherwise wouldn't.
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Reviewed in the United States on February 7, 2026
★★★★★ 3
It's nice enough, but nothing spectacular
This was definitely a gamble since there was no picture provided.... But, my husband needed a newer suit, so we took a chance. Well, it's green! Which is the last thing we expected lol. But, it's not terrible. My husband actually thinks he can do something with it. I'm disappointed because it's only a jacket, pants and tie- not a three piece with a vest like i thought I was getting. Also the fabric just isn't a great material. For $80, it's not great. I've gotten better for $20 from temu. However, it does fit very him very nicely. He's about 5 foot nine or ten, 185lb. If you're in a bind and need a suit in a hurry, this will certainly do just fine. Just know it's not luxury. Pictures are taken right out of the bag, not ironed or anything.
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Reviewed in the United States on February 7, 2026