Holley Ultra XP 4150 Shiny Aluminum 850-CFM Carburetor

Unlock the true potential of your high horsepower engine whether you take it to circle tracks or drag races via this 850-CFM aluminum carburetor (0-80804BKX). Treat yourself to the excellence of a powerhouse that weighs only 4.5 pounds and is 100% wet-flow tested by Holley’s technicians. To take your horsepower to the next level, the venturri inlet is carefully contoured to balance airflow. The air bleeds are then strategically positioned outward, smoothly guiding airflow from the top of the carb into the inlet. Together, they guarantee the utmost airflow efficacy with the bonus of a 4-corner idle for precision control.

Features and Benefits:
- 850-CFM, 4150-style carburetor with shiny finish
- Aluminum construction weighs 4.5 lbs & offers 38% in weight savings
- Perfect for drag race, circle track, or any high horsepower engine
- Contoured venturri inlet balances airflow & increases horsepower
- Air bleeds moved outward to smoothly transition airflow
- Fully adjustable, robust metering blocks with true gasket sealing
- Dual 30cc accelerator pumps optimize fuel from idle to full throttle
- Fuel bowl boosts fuel capacity by 20% & tempers sloshing
- Bowl’s empty contents easily accessible via built-in drain plug
- Windows on both sides of bowls for easy, safe fuel level adjustments
- 4-corner idle for precision control over idle system
- Mechanical secondaries create perfect off-the-line launches
- Dual pattern mounting holes work with 4150 & Dominator flanges
- Knurled, hand-adjustable primary & secondary curb idle screws
- Capped primary throttle shaft blocks out debris & contaminates
- Slabbed & undercut throttle shaft boosts airflow
- Adjustable stainless steel secondary linkage
- Linkage allows 1:1 or progressive secondary throttle actuation
- Base plate with boss can be machined for vacuum source
- -8AN inlet threads can be plumbed from other side
- Includes integrated bypass valve, notched float, & jet extensions
- 100% wet-flow tested by Holley technicians

Fuel-efficient as well, the carburetor uses a fuel bowl that boosts fuel capacity by 20% and controls sloshing, thanks in part to its internal baffling. Once emptied, the built-in drain plug makes access to the contents hassle-free. Fuel level adjustment is similarly straightforward because you’ll find there are windows on both sides of the bowls. With the help of the dual 30cc accelerator pumps, it ensures you get the perfect amount of fuel from idle to full throttle. This means the mechanical secondaries create perfect off-the-line launches as well. Plus, the metering blocks are fully adjustable and include a true gasket sealing.

Since the -8AN inlet threads can be plumbed from the other side, the Ultra XP carburetor is great for custom setups. The dual pattern mounting holes also mean you can use it with either 4150 or Dominator-style flanges. Even the stainless steel secondary linkage is adjustable, allowing drivers to use 1:1 or progressive secondary throttle actuation. You can also machine the base plate to accept a vacuum source thanks to its boss. With a knurled design topping off the primary and secondary curb idle screws, adjusting the idle by hand has never been easier.

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