The Holley Aluminum Double Pumper carburetor offers a 38% weight saving versus the standard Double Pumper. It has a mechanical secondary for performance and dual accelerator pumps to provide additional fuel under initial acceleration. Compared to its zinc counterpart Holley's Aluminum Double Pumper will hold its shine longer. It can also be hand polished for a more custom look. The dual feed fuel inlets allow high volume fuel delivery. It is equipped with a manual choke for easy cold startups. The Double Pumper is recommended for use on lightweight vehicles with a manual transmission or an automatic transmission with a high stall and low rear end gears.