Cast aluminum Sidewinder intake manifold. Over the counter speed part for the 427 Medium Riser. The offset carburetor placement was to help provided equal length runners in regards to flow. Single 4 barrel intake manifold as shown. Looking closely at the photos, this one has had a repair performed in the past. Intake shipped bare, less carburetor studs, heater tube, vacuum fittings, and water neck where applicable.
Ford casting number C6AE-9424-J.