Swirl-Torque and Tork-Step Carburetor Spacers supply your engine the best and most efficient air/fuel mixture possible. Dynamometer tests clearly prove that these carburetor spacers increase torque, and make your engine run cleaner and leaner for increased power and improved fuel economy. Phenolic spacers provide added insulating properties for a cooler, denser fuel mixture, and that means MORE POWER! All necessary gaskets and hardware are included in both styles of these of carb spacers. . Note: Not legal for use or sale in any state complying with California regulations.