Product details:

The Cyclones are Professional Products' lowest profile small block Chevy manifolds and are also street-legal on pollution-controlled vehicles. Cyclone manifolds are set up to accept a spread bore carb, but come with an adapter plate that permits the use of square bore carbs. To remain street-legal with a square bore carb, you must use one that is also approved as street-legal for your application. These Professional Products Cyclone manifolds are available in a variety of configurations to suit your needs.