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Holley Gen 3 Marine Ultra Dominator Carburetor 0-80903HBM

Holley Gen 3 Marine Ultra Dominator Carburetor 0-80903HBM
Holley Gen 3 Marine Ultra Dominator Carburetor 0-80903HBMHolley Gen 3 Marine Ultra Dominator Carburetor 0-80903HBMHolley Gen 3 Marine Ultra Dominator Carburetor 0-80903HBMHolley Gen 3 Marine Ultra Dominator Carburetor 0-80903HBMHolley Gen 3 Marine Ultra Dominator Carburetor 0-80903HBMHolley Gen 3 Marine Ultra Dominator Carburetor 0-80903HBM
$2,473.99 ea
NEWBackordered until 06/11/2023
Model: 3990525
Supplier has not provided any fitment data for this product.
[More Info]
The patent pending GEN 3 main–body is 5/16" taller than the previous generation! This new height allowed for larger radius air entries which were optimized using Computational Fluid Dynamics (CFD) software to deliver smoother flow into new fully machined, big bore venturii. The main-body also features an integrated idle bypass valve that allows for idle adjustments while maintaining the correct throttle plate to transfer slot relationship as well as an extended air cleaner flange for easy air scoop attachment when using the available air scoop adapter. The Gen 3 utilizes 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, 12-hole billet booster inserts, fully tunable billet metering blocks, adjustable external linkage, throttle position sensor mounting points and knurled (hand adjustable) curb idle screws. Each calibration has been dyno tested to deliver proven performance!
  • All Aluminum Construction Saves 3.8 lbs. Over Original Models
  • 28% Weight Savings
  • Designed For Marine High HP Engines
  • Fully Machined From Venturi Throat To Throttle Bore
  • Integrated Idle Bypass Valve Allows For Adjustment Of Idle
  • 12 Hole Billet Booster Superior Atomization/Throttle Response
  • Metering Blocks Feature Improved True Gasket Sealing
  • Dual 50CC Accelerator Pumps Fuel From Idle To Full Throttle
  • Fuel Bowl Provides 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
  • Contoured Hex Head Squirter Screws For Streamlined Airflow
Holley Performance Emission Code 4: This part is legal for sale or use on Racing Use Only Vehicles. The following vehicles are considered Racing Use Only Vehicles: Racing Use Only Vehicles are vehicles that are used exclusively for competition 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
Installation Notes:
New or modified fuel lines are required (if replacing existing Holley Dominator 4500 series carburetor - previous bowl machining was 7/8-20, Aluminum Ultra Dominator carburetors come assembled with -6AN to SAE 8 port fittings). 0-80903HBM center to center fuel inlet measurement is now 11.5"

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 Annular
Booster Type Annular
Carburetor Type 4500
Carburetor Use Marine
CFM 1050
Choke None
Circuit 3
Condition NEW
Emission Without EGR
Emission Code 4
Finish Hard Core Gray
Flange 4500
Fuel Gasoline
Fuel Inlet Dual
Fuel Type Gasoline
High Speed Air Bleed 43
Idle Air Bleed Size 65
Intermediate Air Bleed 71
Marine Engine Size Universal
Marine Use Yes
Material Aluminum
Model 4500
Needle and Seat Size 120;120
Part Type Carburetor
Primary Main Jet 84
Primary Power Valve 6.5
Primary Pump Nozzle Size 35
Secondaries Mechanical
Secondary Main Jet 84
Secondary Pump Nozzle Size 35
Secondary Type Mechanical
Supercharged Application No
Throttle Bore 2.000 in.
Type Marine
Usage Marine
Venturii Size 1.690 in.
WARNING CA Proposition 65 WARNING: Cancer and Reproductive Harm


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Holley Gen 3 Marine Ultra Dominator Carburetor 0-80903HBM:
Classic Nova 2023