Xtreme Performance - Holley Ultra XP™ Carburetors

Meet the Holley Ultra XP™ carburetors, where cutting-edge design meets unbeatable performance! These lightweight marvels are up to 38% lighter than traditional race carbs and boast a 20% larger fuel capacity, along with a host of 30 innovative features. You can choose from a sleek Hard Core Gray™ hard coat anodized finish paired with Black™ billet for enhanced corrosion resistance, or opt for the classic natural tumble-polished aluminum with your choice of Black™ or Red™ metering blocks and base plate. The Aluminum Ultra XP is available in sizes ranging from 600 to 950 CFM, including the impressive 750 CFM model.

The Holley Ultra XP carburetors come packed with features designed to optimize your racing experience. With an integrated idle bypass valve, you can fine-tune your idle settings without compromising the throttle plate to transfer slot relationship. The high-capacity fuel bowls ensure you have 20% more fuel available, effectively eliminating starvation issues. Plus, the integrated fuel shelf minimizes aeration, while internal baffling controls fuel slosh for a smoother ride.

Constructed entirely from aluminum, these carburetors are not only lightweight but also fully tunable with billet metering blocks. Adjust your secondary linkage with ease and use the knurled curb idle screws for quick adjustments without needing tools. The Holley Ultra XP carburetors are truly the pinnacle of square bore race carburetors!

Important Downloads:

• Instructions for Part# 0-80803BKX
• Carburetor Numerical Listing for Part #0-80803BKX

Features:

• Lightweight aluminum construction (saves 4.5 lbs - 38% weight savings)
• Stylish black anodized billet aluminum metering blocks and base plate
• Perfect for drag racing, circle track, or any high horsepower engines
• Contoured venturi inlet for balanced airflow and increased horsepower
• Strategically placed air bleeds for smoother airflow transition
• Durable metering blocks with true gasket sealing and full adjustability
• Integrated idle bypass valve for precise idle control, even with radical camshafts
• Dual 30cc accelerator pumps for optimal fuel delivery from idle to full throttle
• 20% increased fuel capacity with baffled fuel bowls to control slosh
• Clear sight windows on both fuel bowls for easy fuel level adjustments
• Convenient drain plug for quick access to empty the bowl
• 8AN (o-ringed) inlet threads for versatile plumbing options
• Four corner idle adjustment for precise control
• Mechanical secondaries for powerful launches off the line
• Elongated mounting holes for compatibility with various intake styles
• Knurled curb idle screws for effortless adjustments
• Debris-resistant primary throttle shaft
• Factory machined accessory mounting hole for easy throttle stop addition
• Stainless steel adjustable secondary link for customizable throttle actuation
• Baseplate designed for potential vacuum source machining
• Includes notched float and jet extensions
• 100% wet-flow tested by Holley technicians to ensure it's ready to run!

Specifications:

• Barrels: 4
• Billet Color: Shiny with Black Billet
• Booster: Down Leg
• CFM: 750
• Choke: None
• Circuit: 2
• Emission Code: 3
• Finish: Shiny
• Fuel: Gasoline
• Fuel Inlet: Dual
• Material: Aluminum
• Model: 4150
• Primary Main Jet: 76
• Primary Power Valve: 6.5
• Primary Pump Nozzle Size: 32
• Product Type: Ultra XP Carburetor
• Secondaries: Mechanical
• Secondary Main Jet: 76
• Secondary Pump Nozzle Size: 32
• Supercharged Application: No
• Throttle Bore: 1.688 inch
• Venturi Size: 1.376 inch
• Warranty: Limited 90 Day

Notes:

• 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 have a spreadbore style intake manifold, an adapter will be necessary for installation, similar to the Mr. Gasket #1932.