Holley Performance 0-83570 Street Avenger Carburetor, 4 Barrels, 570 CFM, Vacuum Secondary, Electric Choke, Aluminum Holley a trusted industry leader Features a tumble polished finish - can also be hand polished Optimized street calibration that works-out-of-the-box Factory preset electric choke for easy startups Glass fuel level sight windows for easy, safe float adjustments Vacuum secondaries allow use on a wide variety of vehicles. Quick Change vacuum housing cap allows you to tune for performance or fuel economy (springs included) 4 corner idle allows you to precisely control your idle system Aluminum construction for a 44% weight savings. Compatible with GM, Chrysler, and Ford A/T kickdown linkage. Additional parts may be required.