Holley Ultra XP Carburetor 2-Barrel 2300-Style 500 CFM

Embrace the potency of a carb that’s approved by NASCAR for their Mid-West/West Coast Late Model Divisions with this Holley Ultra XP 500-CFM 2-Barrel 2300-Style Carburetor (0-4412BKX)! With the 100% aluminum construction of this 2-barrel carb, you’ll see nearly 50% worth of weight savings over zinc versions. A 1-3/8” venturii inlet then helps unclog airflow, reaching groundbreaking power with the choke tower-free design. You even get smoother airflow transitions since the air bleeds are pointed outward. A knurled curb idle screw then allows easy adjustment over the idle system by hand, all without tools.

Features and Benefits:
- 100% aluminum, tumble-polished 2-barrel carb
- Nearly 50% weight savings over zinc versions
- Approved in NASCAR Mid-West/West Coast Late Model Divisions
- No choke tower & 1-3/8” venturii inlet for unobstructed airflow
- Air cleaner flange centered over venturii improves performance
- Air bleeds positioned outward for smooth airflow transition
- Knurled, curb idle screw allows idle adjustment by hand
- Fuel bowl boosts fuel capacity by 20% & tempers sloshing
- Bowl’s empty contents easily accessible via built-in drain plug
- Fuel trough built into bowl floor to route fuel directly to jets
- Wedge float provides fuel control while cornering
- Down-leg boosters improves fuel signal
- Anti-siphon valve in 30cc pump reduces pump pull over
- 1-11/16” throttle bore & throttle plate/shaft
- Race-devoted throttle lever lacks street attachment pts/tangs
- Throttle shaft capped to block out debris & contaminates
- Set screw for wide open throttle stop adjustment
- Black anodized metering block & base plate
- Metering block has internal pump passage w/ tunable bleed off
- Screw-in air bleeds are easy to fine tune
- 8AN O-ring inlet threads allow plumbing from either side

Not only does the fuel bowl boost fuel capacity by 20%, but it also tempers sloshing with the help of the internal baffling. It even routes fuel directly to the jets by way of the fuel trough that’s built into the bowl’s floor. A drain plug is also integrated, making access to the bowl’s empty contents straightforward. Together with the wedge float and down-leg boosters, you gain immaculate fuel control during cornering and an enhanced fuel signal. Plus, the 30cc pump features an anti-siphon valve that reduces pump pull over!

Devoted to conquering the tracks, the carb’s throttle lever lacks attachment points and tangs for street use. This means you won’t have to worry about it during throttle stop adjustment, which has a wide and open range because of the set screw. The screw-in air bleeds are simple to tune as well, with the metering block boasting a tunable bleed off on its internal pump passage. When put altogether, it cements this 2300-style carb as a powerhouse, complete with a capped throttle shaft to lock out debris and other contaminates.

Vehicle Fitment:
- 1965-1985 Ford Mustang
- 1966-1977 Ford Bronco
- 1948-1979 Ford F-100
- 1960-1987 Chevrolet C10