Performance Carburetor 650CFM 4150 Series

The Performance Carburetor 650CFM 4150 Series by HOLLEY is the go-to choice for engine builders and hot rod enthusiasts seeking reliable fuel delivery in street, strip, and bracket racing applications. This four-barrel carburetor delivers consistent performance across a broad RPM range, making it ideal for small-block and big-block V8 engines producing 350 to 450 horsepower.

Whether you're rebuilding a classic muscle car, tuning a performance engine, or upgrading from a restrictive stock carburetor, the 650 CFM rating provides the ideal air-fuel mixture without excessive fuel consumption or lean-running conditions. The 4150-style mounting flange and dual inlet ports ensure universal fitment on virtually all standard intake manifolds, while the vacuum-secondary design automatically responds to engine load—opening the secondary barrels only when needed for peak performance.

Cast aluminum construction combined with HOLLEY's precision machining delivers excellent heat dissipation and long-term durability in high-temperature engine bays. The carburetor's metering circuits and needle-and-seat design enable fine-tuning adjustments for idle quality, transition, and wide-open-throttle response, giving experienced tuners and mechanics full control over engine characteristics. With a compact footprint measuring 11.2 by 7.9 inches and weighing just 9.45 pounds, installation and underhood clearance are rarely problematic on most platforms.