Xtreme Performance - Holley 4150 Aluminum Ultra XP 950 CFM Carburetor

Meet the Holley 4150 Aluminum Ultra XP 950 CFM carburetor, your go-to choice for serious performance on the track! These Ultra XP carburetors are designed to be 38% lighter than traditional race carbs, making them a fantastic option for those looking to shed some weight without sacrificing power. With a fuel capacity that's 20% larger and packed with 30 innovative features, this carburetor is built for the serious racer.

Available in a striking Hard Core Gray™ anodized finish paired with Black™ billet accents, this carburetor not only looks great but also offers improved corrosion protection. Prefer a classic look? Choose the natural tumble-polished aluminum version, complete with your choice of Black™ or Red™ metering blocks and base plate.

The Ultra XP series includes a variety of sizes, from 600 to 950 CFM, ensuring you find the perfect fit for your engine. Some standout features include an integrated idle bypass valve for easy idle adjustments, high-capacity fuel bowls that eliminate starvation issues, and a unique internal baffling system to control fuel slosh.

Crafted entirely from aluminum, this carburetor boasts fully tunable billet metering blocks, an adjustable secondary linkage, and knurled curb idle screws that allow for quick adjustments without any tools. The Holley Ultra XP carburetors are truly the pinnacle of square bore race carburetors!

• Instructions for Part# 0-80805BKX
• Carburetor Numerical Listing for Part #0-80805BKX

• Lightweight aluminum construction saves 4.5 lbs (38% weight reduction)
• Stylish black anodized billet aluminum metering blocks and base plate
• Perfect for drag racing, circle track, or any high horsepower setups
• Contoured venturi inlet ensures balanced airflow for increased horsepower
• Air bleeds strategically placed for smooth airflow transition
• Durable metering blocks with true gasket sealing and fully adjustable settings
• Integrated idle bypass valve for easy idle adjustments without throttle plate modifications
• Dual 30cc accelerator pumps deliver optimal fuel from idle to full throttle
• 20% increased fuel capacity in fuel bowls with internal baffling to minimize slosh
• Clear sight windows on both sides of bowls for hassle-free fuel level checks
• Convenient drain plug at the front center of the bowl for easy emptying
• 8AN o-ringed inlet threads for versatile plumbing options
• 4 corner idle system for precise idle control
• Mechanical secondaries for excellent off-the-line performance
• Elongated mounting holes for compatibility with various intake types
• Knurled curb idle screws for effortless adjustments
• Primary throttle shaft capped to keep debris out
• Throttle shaft designed for improved airflow
• Factory machined accessory mounting hole for easy throttle stop installation
• Stainless steel adjustable secondary link for customizable throttle actuation
• Baseplate includes a boss for potential vacuum source machining
• Comes with notched float and jet extensions
• Each unit is 100% wet-flow tested by Holley technicians before it reaches you!

• Barrels: 4
• Billet Color: Shiny with Black Billet
• Booster: Down Leg
• CFM: 950
• Choke: None
• Circuit: 2
• Emission Code: 3
• Finish: Shiny
• Fuel: Gasoline
• Fuel Inlet: Dual
• 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
• Venturi Size: 1.600 inch
• Warranty: Limited 90 Day

• This carburetor features a square bore flange bolt pattern, making it compatible with Holley, Edelbrock, Carter AFB, and Autolite style carburetors with a 5 3/16" x 5 5/8" bolt pattern. If you're using a spreadbore intake manifold, you'll need an adapter to install this carburetor, similar to the Mr. Gasket #1932.