These engines are usually to be found fitted onto ride on lawnmowers and garden tractors. They are overhead valve and will have a rocker cover with the letters OHV cast into the front. They will usually have the word Vanguard prominently displayed on the engine cowling. The Model, Type and Code numbers are either on a narrow plate rivited to the top cover or stamped into the cover just above the rocker cover. Their models begin with 260???, 261??? or 28Q???