SKU: 19167345524

500 CFM Ultra XP 2BBL Carburetor - 0-4412HBX

Sale price$414.88 Regular price$460.98
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Ships within 48 hours · Estimated delivery Aug 6 - Aug 11

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Description

500 CFM Ultra XP 2BBL Carburetor - 0-4412HBXOverview: The original Holley 0 4412 has powered thousands of racers to the winners' circle! How do you make it better? Add the proven design elements of the popular Ultra series for more tunability, more durability, more weight savings and more features! The Ultra XP 2bbl carburetors feature all aluminum construction for nearly 50% weight savings over their zinc counterparts, contoured venturii inlet for unobstructed airflow, screw in air bleeds for

Overview:

The original Holley 0-4412 has powered thousands of racers to the winners' circle! How do you make it better? Add the proven design elements of the popular Ultra series for more tunability, more durability, more weight savings and more features! The Ultra XP 2bbl carburetors feature all aluminum construction for nearly 50% weight savings over their zinc counterparts, contoured venturii inlet for unobstructed airflow, screw in air bleeds for easy fine tuning, black anodized fully adjustable billet aluminum metering block and baseplate, high capacity fuel bowl which features 20% more fuel capacity to eliminate starvation, integrated fuel shelf to minimize fuel aeration and internal baffling to control fuel slosh and a centered air cleaner flange for improved airflow and performance. Other notable features include wedged floats, knurled hand adjustable curb idle screw and down leg boosters. Ultra XP 2bbl carburetors are approved for use in NASCAR® Mid-West/West Coast Late Model Divisions and utilize the same venturii and throttle bore dimensions of the classic 4412 2bbl carburetor. Available in shiny or Hard Core Gray finishes, the Ultra XP 2bbl will outperform any production 2bbl available.

Features:

  • 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 and performance. 5/16-18 bent air cleaner stud included
  • Down-leg boosters for improved fuel signal
  • Contoured hex head squirter screw for streamlined airflow
  • 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
  • Fuel bowl provides 20% more fuel capacity while controlling slosh with internal baffling
  • Clear sight windows on both sides of bowl for easy & safe fuel level adjustments
  • Fuel trough designed into floor of bowl to route fuel flow directly to the jets and assists in keeping jets covered by fuel
  • Built in drain plug provides easy access to empty contents of bowl
  • -8 (O-ring) inlet threads offer a large variety of plumbing options (come with an extended -8 O-ring to -8AN male adapter and -8 plug). Can be plumbed from either side
  • Throttle shaft rides in oil impregnated sintered bronze bushings for smooth throttle actuation
  • Throttle shaft capped to prevent entry of debris & contaminates
  • 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
  • Knurled (hand adjustable) curb idle screw allows for easy idle adjustment without the use of tools
  • Set screw for wide open throttle stop adjustment
  • Wedge float provides fuel control while cornering
  • 100% wet-flow tested by Holley technicians to assure it arrives ready to run!

Application:

Year Make Model Submodel Engine Size
Universal

Specs:

Barrels 2
Billet Color Hard Core Gray with Black
Booster Down Leg
Brand Holley
Carburetor Use Performance and Race
CFM 500
Choke None
Condition New
Emission Code 3
Finish Hard Core Gray
Fuel Gasoline
Fuel Inlet Single
Marine Use No
Material Aluminum
Model 2300
Primary Main Jet 74
Primary Power Valve 3.5
Primary Pump Nozzle Size 28
Product Type Carburetor
Secondaries None
Supercharged Application No
Throttle Bore 1.688 inch
Venturii Size 1.376 inch
Warning California Proposition 65
Warranty Limited 90 Day
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 19167345524

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Suz
Whiting, US
★★★★★ 5
Best treat for puppy
My vet and puppy’s trainer recommend this treat for my puppy. Much better than rawhide bones for digestion. My puppy loves the flavored sticks. Peanut butter is her favorite. She gets very excited when I pull out treat. She takes stick and runs to her “place” to chew. Stops desire to chew on furniture, etc. I buy several packages at a time because she loves them and I love quiet down time.
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Reviewed in the United States on December 9, 2024
N
Verified Purchase
N. Shea
Battle Creek, US
★★★★★ 4
Not long lasting but my dog loves them
Flavor Name: Peanut Butter, Size: 20 Count (Pack of 1)
My little dog loves them. But they are NOT long lasting and definitely require supervision. Would love to find a product that would last longer than ten minutes,
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Reviewed in the United States on May 28, 2026
H
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Happy Traveler
Lowell, US
★★★★★ 5
Good Quality Chew for Dogs with Sensitive Stomachs
Flavor Name: Peanut Butter, Size: 40 Count (Pack of 1)
I have a small dog with a sensitive stomach and these sticks are perfect for him. It's a low calorie treat that takes him 10-15 minutes to eat and he really likes the peanut butter taste. These are not cheap but by purchasing them in the 40-pack box it's a little less expensive than the smaller 10 pack bags. I know there are cheaper brands for this type of chew stick, but I like that this product is made in the US and so I don't worry as much about poor manufacturing practices or unknown additives.
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Reviewed in the United States on July 26, 2025
J
Verified Purchase
Jill Carroll
Belleville, US
★★★★★ 5
Great quality!
Great quality and ingredients. These are SAFE alternative to dangerous raw hide treats. My pups love these so much, they chew on them before bed every night. It's like a pacifier for them. It's a game for my husband and I to find their little stash spots in our bed. I've tried other brands and these are the only ones our pups will eat. I love that I don't have to worry about the safety of the ingredients. If you feed your dogs raw hide, I strongly recommend switching to these.
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Reviewed in the United States on December 1, 2024
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Amazon Customer
Massapequa, US
★★★★★ 5
Great for aggressive chewers!
Size: Jumbo, Style: Peanut Butter
I have a very very aggressive chewer. She is a Rottweiler/Pitbull mix. Most toys she completely destroys within 2 days, sometimes 2 hours. I must praise this toy as she has had it for over 5 months and has not destroyed it! She loves chewing the ends and carries in her mouth squeaking it as she goes. I have 4 pups and they all take turns chewing when they can. I will be buying more Playology dog toys in the future. Thank you for making such a great toy!!
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Reviewed in the United States on April 26, 2026

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