Edelbrock 9906 Performer 600 CFM Vacuum Secondary Electric Choke Remanufactured Carburetor Completely disassembled, inspected, and thoroughly cleaned before reassembly Designed for fuel economy Includes carburetor studs and hardware Enhances smoother acceleration and a better drive Backed by a 30 day manufactory guaranty and 100% warranty Step-Up Spring - orange (5 inches Hg)