Holley 0-80813BKX Aluminum Ultra XP Circle Track Carburetor 750 CFM 4150 Mechanical Secondaries Shiny Gasoline

Xtreme Performance - Holley Ultra Xptm Circle Track Carburetors! Ultra Xp carbs are up to 38 percent lighter than our traditional race carbs, have fuel capacity that is 20 percent greater and 30 other new features!

They're available in our Hard Core GrayTM hard coat anodized finish with BlackTM billet for improved corrosion protection & also available in natural tumble-polished aluminum with BlackTM 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 percent 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 and Benefits:

• Aluminum Construction (saves 4.5 lbs - 38 percent 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 percent 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 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 percent wet-flow tested by Holley technicians to assure it arrives ready to run!

Associated Comments:

• This carburetor was designed with a dual mounting pattern, so that it can be installed on a manifold machined for a 4150 or 4500 series carburetor.

Details:

• Barrel Quantity: 4.0
• Billet Color: Shiny with Black Billet
• Body Color: Polished
• Body Finish: Polished
• Booster: Downleg
• Booster Design: Downleg
• CFM: 750.0
• Carburetor Material: Aluminum
• Carburetor Use: Professional Race
• Circuit: 2.0
• Condition: New
• Cubic Feet Per Minute Rating: 750.0
• Finish: Shiny
• Flange Type: Square/4150
• Fuel Type: Gasoline
• Fuel Inlet: Dual
• Grade Type: Performance
• Linkage Attached: Yes
• Marine Approved: No
• Marine Use: No
• Material: Aluminum
• Model: 4150
• Mounting Hole Quantity: 4.0
• Primary Jet Diameter: 78.0
• Primary Main Jet: 78.0
• Primary Power Valve: 6.5
• Primary Pump Nozzle Size: 32.0
• Secondaries: Mechanical
• Secondary Main Jet: 86.0
• Secondary Pump Nozzle Size: 32.0
• Spacer Included: No
• Supercharged Application: No
• Throttle Bore: 1.688 inch
• Venturii Size: 1.376 inch
• Warranty: Manufacturer's Limited 90 Day Warranty

Installation Guide: Download PDF

Installation / Product Video: Watch on YouTube

⚠️ California Proposition 65 Warning
California Residents: This product can expose you to chemicals which are known to the State of California to cause cancer or other reproductive harm. Please visit www.p65warnings.ca.gov for more information.