An adjustable row unit (20) for a header (12) of an agricultural harvester is disclosed. The row unit includes a movable deck plate (36a). The deck plate is connected to a row unit frame (46) extending in a fore and aft direction of the header. A pivot shaft (80) extends in the fore and aft direction and is pivotably connected to the row unit frame and the deck plate. A rocker assembly (52) connects the deck plate to the pivot shaft for enabling selective positioning of the deck plate relative to the row unit frame in a direction substantially transverse to the fore and aft direction and whereby parallelism between the deck plate (36a) and an opposing deck plate (36b) is maintained throughout the crop harvesting process.
