These Edelbrock Performer RPM Vortec intake manifold and carburetor kits are intended for small block Chevy engines fitted with either 1996 and later cast iron Vortec heads or Edelbrock's E-Tec aluminum heads. Performer RPM Vortecs are great for street rods, engine swaps, or industrial applications. They're also set up for either square-bore or spread-bore carburetors and produce power from 1,500 to 5,500 rpm. The kits include an 800 cfm Thunder Series AVS carburetor with an electric choke for easy drivability.