They were designed with the weekend racer in mind. The carburetors are available in 650-850 cfm mechanical secondary models, as well as a 750 cfm vacuum secondary model. The Demon Carburetion Screamin' Demon carburetors feature lightweight die-cast aluminum construction, large-capacity fuel bowls complete with dual sight glasses, dual threaded inlets on each side, and internal baffling to prevent fuel slosh when you are on the track. They have been engineered and calibrated for better drivability and full throttle performance. The carburetors include four-corner idle, changeable idle, and high-speed air bleeds with all the tunability that you would find in the more expensive carburetors on the market.