- Holley Supercharger Double Pumper Carburetor is engineered specifically for blown applications, offering sharp throttle response and strong launch performance in lightweight performance builds
- Equipped with dual accelerator pumps to deliver extra fuel during hard initial throttle input
- Features mechanical secondaries and dual-feed fuel inlets to accommodate increased fuel demand
- Includes a boost-referenced power valve that monitors intake vacuum below the supercharger to provide proper enrichment under boost
- Calibrated for Small Block Chevrolet 1x4 170-series blower setups and incorporates four-corner idle adjustment for fine-tuning capability
- Outfitted with a manual cable-operated choke, tumble-polished bright finish, and is 100 percent wet-flow tested by Holley technicians
- Covered by a 1-Year Limited Warranty
The Double Pumper has long been a staple in high-performance circles, known for delivering instant throttle response and proven track results. For builds that incorporate forced induction and demand aggressive acceleration, a carburetor specifically calibrated for boost is essential. The Holley Supercharger Double Pumper Carburetor is developed to meet those performance expectations while maintaining classic muscle car character.
Designed for supercharged combinations, this carburetor is well suited for lightweight vehicles equipped with a manual transmission or an automatic transmission featuring a high stall converter and steep rear gearing. It utilizes dual accelerator pumps to provide added fuel during rapid throttle input, along with mechanical secondaries to promote strong launch characteristics. Dual fuel inlets support high-volume fuel delivery, and a manual cable-operated choke allows controlled cold starts. The tumble-polished finish adds a bright, performance-focused appearance. This version features a small block Chevrolet 1x4 170 series blower calibration, four-corner idle adjustment for detailed tuning, and a boost-referenced power valve that senses intake manifold vacuum beneath the supercharger to help ensure proper fuel enrichment under load. Each carburetor is wet-flow tested prior to shipment to promote out-of-the-box readiness.
By referencing vacuum below the supercharger, the power valve responds to actual engine demand rather than blower vacuum, helping provide accurate fuel delivery during acceleration and boost conditions. This product is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles, including 1965 and older California-certified vehicles, 1967 and older federally certified vehicles, and 1967 and older foreign-manufactured vehicles. Installation on Emissions Controlled Vehicles—such as 1966 and newer California-certified vehicles, 1968 and newer federally certified vehicles, and 1968 and newer foreign-manufactured vehicles—is prohibited by law. Backed by a 1-Year Limited Warranty.