Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 13 - Jul 18
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
950CFM Ultra XP Carburetor - 0-80845HBXOverview: 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
- E85 specific calibration
- 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.
- 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
- .130" stainless needle & seats to control the demand of E-85
- 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
- Stainless steel throttle plates
- 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 | 950 |
| Choke | None |
| Condition | New |
| Emission Code | 3 |
| Finish | Hard Core Gray |
| Fuel | E-85 |
| Fuel Inlet | Dual |
| High Speed Air Bleed | 24 |
| Idle Air Bleed Size | 67 |
| Marine Use | No |
| Material | Aluminum |
| Model | 4150 |
| Primary Main Jet | 96 |
| Primary Power Valve | 5.5 |
| Primary Pump Nozzle Size | 42 |
| Product Type | Ultra XP Carburetor |
| Secondaries | Mechanical |
| Secondary Main Jet | 106 |
| Secondary Pump Nozzle Size | 50 |
| 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.
- 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
4.7 ★★★★★
Based on 1831 reviews
Sort
Product Reviews
★★★★★ 5
Great Boys Suit Vest
Color: Black, Size: 12, Color: Black, Size: 12
I recently had a chance to pick up this boy's suit vest for my upcoming wedding, and it is absolutely perfect. It fits my son so well, running very true to size. The material is so silky smooth and soft, he absolutely loves it. He's autistic and has a thing about different fabrics and this does not irritate or bother him at all. It is going to be perfect over his long sleeve button down shirt. The best looks amazing on him, and the black color is definitely a very dark true black. It is such a great value for the money, you will not be disappointed! I highly recommend picking this up if you need one for your boy or if you have a family member who needs one for an upcoming event.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 4, 2026
★★★★★ 4
Boys vest
Color: Black, Size: 8
The vest looks nice.
It seems well made and looks high quality.
The fabric is nice.
The buttons seem very sturdy.
The vest is lightweight and shouldn’t be too sweaty.
It’s a nice versatile piece. Can be dressed up or down.
The fit is a smidge awkward on my boys, but they still like it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 19, 2026
★★★★★ 5
Looks very nice and sizing is right
Color: Navy Blue, Size: 14, Color: Navy Blue, Size: 14
I ordered this for my 13-year-old who currently wears a size 12-14. He's closer to the 12, but has enough clothes in that size, so I ordered the 14 in navy blue. He chose the color, although it took him a while to decide. My kids so far have preferred not to go to school dances or dressier school functions, but I try to keep an outfit on hand in case they need it, and he does have to dress up a little for school band performances. He doesn't really have any kind of clothing preferences (yet), and is just as likely to look dressed up as he is to wear something completely wrinkled (but clean).
This vest fits as expected. It is a bit large on him to the same degree that the other size 14 clothes he has are. He is pretty skinny, so while I think it would fit someone who is more average sized, I'm not sure how well it will do on huskier sizes. It has a nice buckle on the back as most men's vests like these have, so it can be adjusted in that sense.
The navy color is a bit of a brighter shade than your average navy, but not outside of the normal range for navy. I like it. It’s hard to get the exact color in pictures.
The fabric and construction both seem to be good quality. The fabric feels average compared to my husband's dress vests, better than the lower quality/cheaper ones and not quite as nice as the ones he spent more on. This boy's dress vest is currently being sold for approximately $20, which I think is great for a nice dress vest like this.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 27, 2026
★★★★★ 5
"Navy Vest & Pocket Square Charm; Formal Polish for Perfect Pairing
Color: Navy Blue, Size: 8, Color: Navy Blue, Size: 8
This very charming boys navy blue vest pairs perfectly with the accompanied pocket square, adding formal charm to dockers or navy khakis. My boys look dapper in matching sets. A timeless style that elevates any outfit.
Made with quality fabric that appears to resist wrinkles, with the pocket square folding neatly for that polished touch. Comfortable and event ready.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 14, 2026
★★★★★ 5
Adorable boys vest! Dress up or down!
Color: Light Gray, Size: 5, Color: Light Gray, Size: 5
Super cute vest! Made of quality materials. The buttons on the front all work very well. My four year old can easily button and unbutton them himself. All 3 pockets in the front are functional cute little pockets. There are vertical line stitchings making this vest look just like dad's. The back is easily adjustable. I will stay I was nervous it was going to be too big for my almost 4 year old - I ordered the smallest size available, size 5 and it actually fits him perfectly. In fact, I could even have gotten him the size 6 and it would have fit so I recommend to size up. It's a breathable vest. The gray color goes with lots of other colors. It's an adorable vest. You can dress it up with a nice suit or dress down. It's adorable with a t shirt and jeans. The inside back is a nice silky material. This vest is very well made - its thick but breathable and a great value for the dollar. I highly recommend.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 6, 2026