Abstract: An edge-pivot charge-motion control assembly for controlling air turbulence comprising a molded sleeve inserted into a runner port of an intake manifold of an internal combustion engine. A control valve element is pivotably mounted in the sleeve for external actuation. The valve element pivots into a formed recess in a wall of the sleeve and thus may be fully removed as desired from the air stream. The system allows customizing of the valve shape and also the entrance and exit geometry of the runner sleeve as desired for any engine intake manifold, thus affording great flexibility in use with a series of engines of various displacements using essentially the same head. The charge motion function between engines, and even between runners in a given engine, can be changed inexpensively by changing a small, relatively inexpensive mold tool, rather than a large, very expensive manifold mold tool.