A header of an agricultural harvester for the transport of a flow of crop from a header to a combine feeder house. The header includes a frame having a floor, a conveyor assembly, and a drive mechanism. The conveyor assembly is mounted above the floor to urge a flow of crop material during harvesting operations, and the drive mechanism operatively connects to the conveyor assembly to drive movement of the conveyor assembly. The drive mechanism includes a drive motor mounted to the frame beneath the floor about a medial section of the header.