Holley 4500 1250 CFM 3 CIR - HARD BLACK

The original Dominator® revolutionized carburetion back in 1969 when it was created for NASCAR® racing. Since then, it has undergone numerous refinements, culminating in its most significant transformation yet. Meet the Gen 3 Ultra Dominator, featuring a completely redesigned main body, cutting-edge calibrations, high-volume fuel bowls, and options that reach up to an impressive 1475 CFM!

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

Another standout feature is the integrated idle bypass valve, enabling you to adjust the idle while keeping the throttle plate to transfer slot relationship just right. Plus, the extended air cleaner flange makes it a breeze to attach an air scoop using the compatible air scoop adapter.

The Gen 3 boasts high-capacity fuel bowls that offer 20% more fuel capacity, effectively eliminating starvation issues. With an integrated fuel shelf to reduce fuel aeration and internal baffling to manage fuel slosh, this carburetor is built to perform. Additional 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 curb idle screws that you can adjust by hand.

Each calibration has been rigorously tested on both the dyno and the track to ensure reliable performance!

Important Downloads:

• Instructions for Part# 0-80908HB
• Carburetor Numerical Listing for Part #0-80908HB

Features:

• Lightweight all-aluminum construction saves 3.8 lbs compared to original models (28% weight savings)
• Striking 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 engine
• Calibrations fine-tuned for today's larger race engines and modern fuels
• Fully machined from venturi throat to throttle bore for consistent and repeatable performance
• Integrated idle bypass valve for easy idle adjustments while maintaining optimal throttle plate alignment
• 12-hole billet booster inserts for exceptional atomization and rapid throttle response
• Durable metering blocks with true gasket sealing and fully adjustable features (emulsion bleeds, power valve channel restrictors & idle feed restrictors)
• Dual 50cc accelerator pumps deliver the perfect fuel amount from idle to full throttle
• Fuel bowls with 20% more capacity and internal baffling to control slosh
• Clear sight windows on both sides of the bowls for straightforward and safe fuel level adjustments
• Convenient built-in drain plug at the front center of the bowl for easy emptying
• -8 (o-ringed) inlet threads provide a variety of plumbing options, allowing for plumbing from either side
• Factory-ready TPS mounting points compatible with data acquisition systems (Holley TPS P/N 534-214 available)
• Knurled primary and secondary curb idle screws are hand-adjustable for quick idle tweaks
• Contoured hex head squirter screws designed for streamlined airflow
• 100% wet-flow tested by Holley technicians to ensure it's ready to run right out of the box!
• Fully adjustable stainless steel external linkage that can be set for 1:1 progressive or soft progressive throttle activation, with no linkage parts beneath the carburetor

Specifications:

• Barrels: 4
• Billet Color: Hard Core Gray with Black
• Booster: Annular Billet Insert
• CFM: 1250
• Choke: None
• Circuit: 3
• Emission Code: 4
• Finish: Hard Core Gray
• Fuel: Gasoline
• Fuel Inlet: Dual
• High Speed Air Bleed: 34
• Idle Air Bleed Size: 51
• Intermediate Air Bleed: 70
• Material: Aluminum
• Model: 4500
• Needle and Seat Size: 120;120
• Primary Main Jet: 92
• Primary Power Valve: 5.5
• Primary Pump Nozzle Size: 40
• Product Type: Carburetor
• Secondaries: Mechanical
• Secondary Main Jet: 102
• Secondary Pump Nozzle Size: 40
• Supercharged Application: No
• Throttle Bore: 2.125 inch
• Venturi Size: 1.880 inch
• Warranty: Limited 90 Day

Notes:

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