Performance Carburetor 850CFM 4150 Series

The HOLLEY Performance Carburetor 850 CFM 4150 Series is a double-pumper four-barrel carb engineered for serious engine builders and hot rod enthusiasts demanding high-flow fuel delivery and precise fuel metering across the RPM band. With 850 cubic feet per minute of rated flow, this square-bore design delivers the air and fuel mixture required for naturally aspirated engines seeking peak horsepower and torque without electronic fuel injection complexity.

The 4150 platform incorporates mechanical secondary operation, meaning the secondary barrels open progressively in response to engine load rather than vacuum signal, providing responsive throttle control during acceleration and steady cruising. The dual inlet system accommodates both front and rear fuel feed configurations, offering installation flexibility across different engine bay layouts. Manual choke operation gives builders complete control over cold-start enrichment, essential for vintage restoration and high-performance street applications. Construction in cast aluminum with tumble-polished finish combines corrosion resistance with classic cosmetic appeal—the polished surface resists oxidation common in high-heat engine compartments while maintaining the aesthetic preferred in show applications.

This carburetor suits small-block and big-block engine builds from 350 ci to 500+ ci displacement where traditional mechanical fuel delivery outperforms modern EFI conversions. The 850 CFM rating sits at the threshold between streetable responsiveness and race-oriented fuel flow, making it ideal for mixed-duty platforms—street machines, weekend track cars, restorations seeking OEM-style functionality, and marine applications where fuel system simplicity and reliability are priorities. Experienced builders value the 4150 series for its tuning accessibility, extensive jet and needle availability, and proven track record across decades of automotive performance.