Edelbrock Carburetor Two-Barrel Progressive Throttle Linkage Kit 3X2The Edelbrock part #1033 Progressive Linkage Kit is designed to smooth throttle response, eliminate flat spots and improve fuel economy. It achieves this by only opening the center carburetor at less than 50% (or 33%) pedal travel thus sharpening the venturi signal and eliminating the bottom end bog found in traditional multiple carburetor setups that open simultaneously. This kit can also be installed in a non progressive configuration, if so