The 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 desired, or can progressively operate a dual two-barrel carburetor configuration.; Due to the need for making fine adjustments and inspections, Edelbrock recommends installing the carburetors and linkage kit prior to installing the manifold on the engine. If you have another make or model of manifold, it may be necessary to alter some of the details of this installation. This kit has a relatively universal application and can be safely installed in a variety of configurations.; Capped rod may require trimming to clear the manifold.; If you have another make or model of manifold, it may be necessary to alter some of the details of this installation. This kit has a relatively universal application and can be safely installed in a variety of configurations.; Be sure to always check that the arms will not become inverted after any adjustment. Some trial and error will be required to achieve a properly balanced set up.; Proper installation is the responsibility of the installer. Improper installation will void your warranty and may result in poor performance and engine or vehicle damage.