855.444.6872 Contact Us Mon-Fri 10a-6p & Sat 10a-3p EST

Holley Ultra XP Carburetor 0-80835HBX

Holley Ultra XP Carburetor 0-80835HBX
Holley Ultra XP Carburetor 0-80835HBXHolley Ultra XP Carburetor 0-80835HBXHolley Ultra XP Carburetor 0-80835HBXHolley Ultra XP Carburetor 0-80835HBXHolley Ultra XP Carburetor 0-80835HBX
$1,943.99 ea
NEWARRIVING SOONEstimated Ship Date 06/20/2023 (If Ordered Today)22 available from HOLLEY PERFORMANCE PRODUCTS as of 05/31/2023
Model: 3990511
Supplier has not provided any fitment data for this product.
[More Info]
Xtreme Performance - Holley Ultra XP(TM) Methanol carburetors! Ultra XP Methanol carbs are 38% lighter than our original HP, have fuel capacity that is 20% greater and 30 other new features! They're available in our all-new Hard Core Gray(TM) hard coat anodized finish with Black(TM) billet for improved corrosion protection. Holley Ultra XP Methanol 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!
  • Aluminum Construction
  • Saves 4.5 Pounds 38% Weight Savings
  • Methanol Specific Calibration
  • Contoured Venturi Inlet Balances Airflow For Increased hp
  • Metering Blocks/True Gasket Sealing/Fully Adjustable
  • Idle Bypass Valve Eliminates Holes In Throttle Plates
  • Dual 50CC Accelerator Pumps Fuel From Idle To Full Throttle
  • Fuel Bowls Provide 20% More Fuel Capacity Controls Slosh
  • Clear Sight Windows On Sides Of Bowl For Fuel Level Adjustments
  • Drain Plug On Bowl Provides Easy Access To Empty Bowl
  • Clear Sight Windows For Easy/Safe Fuel Level Adjustments
Holley Performance Emission Code 3: This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles and Racing Use Only Vehicles. The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles: 1965 and older U.S. manufactured California Certified vehicles/1967 and older U.S. manufactured Federally Certified vehicles/1967 and older Foreign manufactured vehicle. The following vehicles are considered Racing Use Only Vehicles: Racing Use Only Vehicles are vehicles that are used exclusively for competition and that are not registered and that may never be used on the street. WARNING: It is against the law to install this part on an Emissions Controlled Vehicle. The following vehicles are considered Emissions Controlled Vehicles: 1966 and newer U.S. manufactured California Certified vehicles/1968 and newer U.S. manufactured Federally Certified vehicles/1968 and newer Foreign manufactured vehicle
Installation Notes:
This model of carburetor has the square bore flange bolt pattern. It can replace Holley, Edelbrock, Carter AFB, and Autolite style carburetors with 5 3/16" x 5 5/8" bolt pattern. If you have a spreadbore style intake manifold, you will need an adapter to install this carburetor. Similar to the Mr. Gasket #1932.

About Holley Performance Products

Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors powered every Monster Energy NASCAR Cup team and nearly every NHRA Pro-Stock champion for four decades. Now, Holley EFI products power these cars and are dominating the performance world. Holley products for GM's popular LS engine are dominating the LS scene as well. Holley's products also include performance fuel pumps, intake manifolds and engine dress-up products for street performance, race and marine applications. As a single solution or partnered with products from other Holley companies we can give you the edge you need over the competition!


Download Name File Size



Barrel Four
Barrels 4
Billet Color Hard Core Gray with Black
Booster Down Leg
Booster Type Down Leg
Carburetor Type 4150
Carburetor Use Professional Race
CFM 950
Choke None
Condition NEW
Emission Without EGR
Emission Code 3
Finish Hard Core Gray
Flange Square Bore
Fuel Methanol
Fuel Inlet Dual
Fuel Type Methanol
Marine Use No
Material Aluminum
Model 4150
Part Type Carburetor
Primary Main Jet 172
Primary Pump Nozzle Size 50
Secondaries Mechanical
Secondary Main Jet 172
Secondary Pump Nozzle Size 50
Secondary Type Mechanical
Supercharged Application No
Throttle Bore 1.750 in.
Type Automotive
Usage Racing
Venturii Size 1.600 in.
WARNING CA Proposition 65 WARNING: Cancer and Reproductive Harm


Write a Review
* Your Name:
* Email (This will not be displayed)
* Rating:

Ask a question about

Holley Ultra XP Carburetor 0-80835HBX:
Classic Nova 2023