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• All aluminum construction - for nearly 50% weight savings over zinc version
• Tumble polished aluminum with Black™ billet metering block and base plate
• No choke tower for unobstructed airflow
• Air cleaner flange centered over venturii; 5/16-18 bent air cleaner stud included
• Down-leg boosters for improved fuel signal
• Internal pump passage on metering block equipped with tunable bleed off
• Same 1-3/8” Venturii & 1-11/16” Throttle Bore size and Throttle Plate/Throttle Shaft size of original 0-4412
• Clear sight windows on both sides of bowl for easy & safe fuel level adjustments
• -8 O-ring inlet threads offer plumbing options (come with an extended -8 O-ring to -8AN male adapter and -8 plug)
• 30cc pump with metal lever and anti-siphon valve
• Dedicated race-only throttle lever
• Knurled curb idle screw allows for easy idle adjustment
• Set screw for wide open throttle stop adjustment
#NOTE: Due to the California Air Resources Board (CARB) restrictions, we no longer ship carburetors to the state of California.

• All aluminum construction for nearly 50% weight savings over zinc version
• Hard Core Gray with Black™ billet aluminum metering block and base plate
• No choke tower for unobstructed airflow
• Air bleeds moved outward to allow a smoother transition of airflow
• Air cleaner flange centered over venturii for improved airflow; 5/16-18 bent air cleaner stud included
• Down-leg boosters for improved fuel signal
• Same 1-3/8” Venturii & 1-11/16” Throttle Bore size and Throttle Plate/Throttle Shaft size of original 0-4412
• Clear sight windows on both sides of bowl for easy & safe fuel level adjustments
• -8 O-ring inlet threads offer a variety of plumbing options (come with an extended -8 O-ring to -8AN male adapter and -8 plug)
• Throttle shaft rides in oil impregnated sintered bronze bushings for smooth throttle actuation
• 30cc pump with metal lever; anti-siphon valve in mainbody to reduce pump pull over
• Dedicated race-only throttle lever with all unnecessary street attachment points & tangs removed
• Set screw for wide open throttle stop adjustment
#NOTE: Due to the California Air Resources Board (CARB) restrictions, we no longer ship carburetors to the state of California.

• Holley 4150 Aluminum Ultra XP 750 CFM 4-Barrel Carburetor, Black
• Aluminum Construction (saves 4.5 lbs - 38% weight savings)
• Hard Core Gray with black anodized billet aluminum metering block and booster inserts
• Designed for use on Drag race, circle track, or any high horsepower engines
• Contoured venturri inlet offers balanced airflow for increased horsepower
• Dual 30cc accelerator pumps provide the perfect amount of fuel from idle to full throttle
• Clear sight windows on both sides of bowls for easy and safe fuel level adjustments
• -08 AN o-ring inlet threads offer a large variety of plumbing options
• 4 corner idle allows you to precisely control your idle system
• Elongated mounting holes allow fitment on intakes with square flange (4150 style) or large flange (Dominator style)
• Knurled 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
• Stainless steel adjustable secondary link
• Includes notched float and jet extensions
#NOTE: Due to the California Air Resources Board (CARB) restrictions, we no longer ship carburetors to the state of California.

Holley fuel inlet fittings are precisely machined from 2024 aluminum and anodized black for good looks and corrosion protection.

• Long -08 AN male fuel inlet fitting with -08 AN o-ring threads
• For Ultra XP fuel bowls
• Black Anodized Aluminum

• Straight-type accelerator pump discharge nozzles
• Available in a variety of hole sizes
• Nozzile hole size determines rate of fuel discharge
• Larger hole with shoot fuel at a faster rate & with less pressure than a smaller hole
• Nozzle sizes .040” & larger include a hollow nozzle screw
• Sold as 2-Pack

• Standard main jets for Gasoline carburetors
• 1/4-32 thread
• Available in a variety of sizes, sold in pairs
• Metering orifices control fuel flow into metering system
• Rated in flow capacity ”cubic centimeters per minute” & changeable for tuning purposes
• Shape of entry, exit & size determines flow
• Jets are flow tested & then stamped with the correct number
• Not for use with carburetors originally designed for alcohol

• Standard Alcohol Jet
• 5/16-32 Thread
• 2 Per Package
• Sizes from 132-200
• Fits Holley Models 4150HP & 4500HP originally designed for alcohol
• Not for use with gas carburetors converted to alcohol

• Single–stage power valves
• Standard flow or high flow
• Includes Gasket
• Available in a selection of sizes