Customer trade-in carburetor in good, used condition.  Photos are of actual carburetor offered for sale.

• 1000 monster carb! Largest 4150 carb at an amazing price!
• Features aluminum HP main body:
• Air bleeds moved outward to allow a smoother transition of airflow
• Contoured hex head squirter screws for streamlined airflow
• Integrated pry-points assist in servicing carb
• Billet metering blocks for improved durability, gasket sealing good looks and corrosion protection
• Carb weighs 7 pounds, almost 3 pounds lighter than a cast zinc carb!
• Now with AED billet metering blocks standard on the HO series!
• The HO Series is designed with the Pro-Street and bracket racer in mind featuring clean idle, crisp throttle response, and killer acceleration
• This carburetor is equally at home on the street or race track
• Designed for single four barrel normally aspirated engines
• This professionally prepared off the shelf performance 1000HO carburetor is run, adjusted, and tuned on a test engine before shipping to assure the utmost in quality control.
• Photos above are stock photos: carburetor main body and bowl coloration may vary due to dichromate process

Features:

• Aluminum HP main body: Holley redesigned this HP main body and moved the air bleeds outward to allow a smoother transition of air flow
• All new fully CNC machined casting, all main body surfaces machined for sealing
• Blueprinted & hand assembled
• HP main body (smooth venturi, no choke)
• 50cc secondary accelerator pump and new style Holley fuel level sight windows
• Special high flow billet metering blocks & boosters
• All fuel circuits balanced & calibrated
• Power valve anti-backfire check valve kit
• Four corner idle circuitry for fuel control & tuning capability
• Special non-stick gaskets for easy maintenance
• All carburetors test run with baseline tune
• Made in the USA

Specifications: Primary / Secondary:

• Jets: 84 / 90
• Power Valve: 4.5 / NA 
• High Speed Bleed: .031 / .031
• Idle Bleed: .070 / .070
• Squirter Size: .037 / .037