Xtreme Performance - Holley 4150 Ultra XP™ 750 CFM Carburetor (Hard Black)

Introducing the Holley 4150 Ultra XP™ carburetor – a game changer for your high-performance engine! This lightweight marvel is up to 38% lighter than traditional race carburetors, making it a fantastic choice for those who crave speed without the extra weight. With a fuel capacity that's 20% greater than before and a host of 30 innovative features, this carburetor is designed to take your racing experience to the next level.

Available in a striking Hard Core Gray™ hard coat anodized finish, paired with a sleek Black™ billet, this carb not only looks great but also offers improved protection against corrosion. If you prefer a more classic look, you can opt for the natural tumble-polished aluminum version, complete with your choice of Black™ or Red™ metering blocks and base plate. The Ultra XP comes in various sizes: 600, 650, 750, 850, and True 950-CFM, catering to all your performance needs.

One of the standout features of the Holley Ultra XP carburetor is its integrated idle bypass valve. This clever addition allows for precise idle adjustments while keeping the throttle plate and transfer slot relationship just right. Say goodbye to idle issues, especially when using radical camshafts! Plus, the high-capacity fuel bowls ensure you won’t experience starvation on those intense runs, thanks to 20% more fuel capacity and internal baffling that controls fuel slosh.

With all-aluminum construction, fully tunable billet metering blocks, and an adjustable secondary linkage, this carburetor is fully equipped for performance tuning. The knurled curb idle screws make idle adjustments a breeze, no tools required! And let’s not forget the dual 30cc accelerator pumps that deliver the perfect amount of fuel from idle to full throttle.

Important Downloads:

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

Features:

• Lightweight aluminum construction (saves 4.5 lbs - 38% weight savings)
• Hard Core Gray finish with black anodized billet aluminum metering block and booster inserts
• Perfect for drag racing, circle track, or any high horsepower engine
• Contoured venturi inlet for balanced airflow and increased horsepower
• Outwardly positioned air bleeds for smoother airflow transitions
• Durable metering blocks with true gasket sealing and full adjustability
• Integrated idle bypass valve for optimal idle control
• Dual 30cc accelerator pumps for precise fuel delivery
• 20% larger fuel bowls with internal baffling to minimize slosh
• Clear sight windows for easy fuel level adjustments
• Convenient drain plug for easy bowl emptying
• 8AN (o-ringed) inlet threads for versatile plumbing options
• Four corner idle for precise control
• Mechanical secondaries for powerful launches
• Elongated mounting holes for compatibility with various intake styles
• Knurled curb idle screws for tool-free adjustments
• Debris-proof primary throttle shaft
• Factory machined accessory mounting hole for throttle stops
• Stainless steel adjustable secondary link for ultimate control
• Baseplate designed with a boss for vacuum source machining
• Includes notched float and jet extensions
• 100% wet-flow tested by Holley technicians for guaranteed performance!

Specifications:

• Barrels: 4
• Billet Color: Hard Core Gray with Black
• Booster: Down Leg
• CFM: 750
• Choke: None
• Circuit: 2
• Emission Code: 3
• Finish: Hard Core Gray
• 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 that have a 5 3/16" x 5 5/8" bolt pattern. If your intake manifold is of the spreadbore style, an adapter will be necessary for installation, such as the Mr. Gasket #1932.