An adjustable curved neck guide for a conveyor is disclosed. The guide comprises a plurality of segments mounted on first and second plates using a series of pin and slot assemblies. Each segment has first and second surfaces and a guide edge, the segments arranged end to end such that the guide edges define a curve having radius. As the second plate is moved relative to the first plate, the pins slide in the slots thereby moving the segments and changing the radius of curvature defined by the guide edges.