Trans-Dapt's exclusive design swirl-torque carburetor spacer design gives your engine the best, most efficient air and fuel mixture possible with a carburetor spacer. Dynamometer tests clearly prove that these new generation carburetor spacers increase torque, and make your engine run cleaner, leaner and stronger for increased power and improved fuel efficiency. A poor conductor of heat, phenolic spacers keep heat from transferring from the manifold to the carburetor, for a cooler, denser fuel mixture. That means more power.