Holley 4500 1050 CFM 2 CIR - HARD BLACK

The original Dominator® revolutionized carburetion back in 1969, specifically crafted for NASCAR® racing. Over the years, it has undergone numerous refinements, culminating in its most significant transformation yet. Introducing the Gen 3 Ultra Dominator, which boasts a completely redesigned main body, cutting-edge calibrations, high-volume fuel bowls, and options that go up to an impressive 1475 CFM!

The innovative GEN 3 main body is now 5/16" taller than its predecessor! This height increase allows for larger radius air entries, optimized using advanced Computational Fluid Dynamics (CFD) software to ensure a smoother flow into the newly machined, big bore venturii.

You'll also find an integrated idle bypass valve in the main body, enabling you to make idle adjustments while keeping the throttle plate and transfer slot relationship just right. Plus, it features an extended air cleaner flange for easy attachment of an air scoop when you use the available air scoop adapter.

The Gen 3 includes high-capacity fuel bowls that provide 20% more fuel capacity, effectively eliminating starvation issues. It also has an integrated fuel shelf to reduce fuel aeration and internal baffling to manage fuel slosh. Other highlights 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 rigorously tested on the dyno and at the track to ensure reliable performance!

• Instructions for Part# 0-80902HB
• Carburetor Numerical Listing for Part #0-80902HB

• Constructed entirely from aluminum, saving 3.8 lbs compared to original models (a 28% weight reduction).
• Hard Core Gray finish with black anodized billet aluminum metering block and booster inserts.
• Perfectly designed for drag racing, pro street applications, or any high-horsepower engines.
• Calibrations tailored for today's larger race engines and modern fuels.
• Fully machined from venturi throat to throttle bore for consistent and reliable performance.
• Integrated idle bypass valve for easy idle adjustments while maintaining the correct throttle plate to transfer slot relationship.
• 12-hole billet booster inserts for outstanding atomization and sharp throttle response.
• Durable metering blocks with true gasket sealing and fully adjustable settings (including emulsion bleeds, power valve channel restrictors, and idle feed restrictors).
• Dual 50cc accelerator pumps deliver just the right amount of fuel from idle to full throttle.
• Fuel bowls with 20% increased capacity and internal baffling to control slosh.
• Clear sight windows on both sides of the bowls for safe and easy fuel level adjustments.
• Convenient drain plug located at the front center of the bowl for easy access to empty its contents.
• -8 (o-ringed) inlet threads offer various plumbing options and can be connected from either side.
• Factory-ready TPS mounting points for compatibility with data acquisition systems (Holley TPS P/N 534-214 available).
• Knurled (hand adjustable) primary and secondary curb idle screws for effortless idle adjustments without tools.
• Contoured hex head squirter screws designed for streamlined airflow.
• Fully adjustable stainless steel external linkage for 1:1 progressive or soft progressive throttle activation, with no linkage parts positioned under the carburetor.
• 100% wet-flow tested by Holley technicians to ensure it’s ready to run right out of the box!

• Barrels: 4
• Billet Color: Hard Core Gray with Black
• Booster: Annular Billet Insert
• CFM: 1050
• Choke: None
• Circuit: 2
• Emission Code: 4
• Finish: Hard Core Gray
• Fuel: Gasoline
• Fuel Inlet: Dual
• High Speed Air Bleed: 32
• Idle Air Bleed Size: 57
• Material: Aluminum
• Model: 4500
• Needle and Seat Size: 120;120
• Primary Main Jet: 84
• Primary Power Valve: 5.5
• Primary Pump Nozzle Size: 35
• Product Type: Carburetor
• Secondaries: Mechanical
• Secondary Main Jet: 94
• Secondary Pump Nozzle Size: 35
• Supercharged Application: No
• Throttle Bore: 2.000 inches
• Venturii Size: 1.690 inches
• Warranty: Limited 90 Day

• New or modified fuel lines are required if you are replacing an existing Holley Dominator 4500 series carburetor. The previous bowl machining was 7/8-20, while the Aluminum Ultra Dominator carburetors come assembled with -6AN to SAE 8 port fittings. The center-to-center fuel inlet measurement is now 11.5".