This is the Cylinder Head for the O.S. 110FS-a 4-Stroke Engine, OSMG0990. / / FEATURES: Replaces damaged cylinder heads / One-piece aluminum construction / / INCLUDES: One Heatsink Head for the O.S. 110FS-a Engine / One Brass Head Gasket / / REQUIRES: Assembly on Engine / / cnh 12/16/08 / ir/jxs