The Holley 850 CFM Double Pumper is built for serious performance, delivering the fuel flow and throttle response demanded by high-horsepower street and track builds. Its mechanical secondaries and dual accelerator pumps provide instant, hard-hitting power throughout the RPM range, while the manual choke keeps things simple and tunable. Built on Holley’s proven 4150 platform with durable construction and precision calibration, this 850 Double Pumper is the go-to choice for strokers, or any engine that thrives on maximum airflow and crisp, consistent performance.