Kammala jumla mai zuwa: A lokacin Lotus da Clark sun yi amfani da motoci da injuna daban-daban guda uku. Lotus 43 ya yi mummunan aiki a farkon Grand Prix na Afirka ta Kudu, don haka Clark ya yi amfani da tsohuwar Lotus 33 a Grand Prix na Monaco na gaba, ya yi ritaya tare da gazawar dakatarwa. Daga nan sai Lotus ya fara haɗin gwiwa tare da Ford-Cosworth. Motocinsu na farko, Lotus 49 wanda ke dauke da injin F1 mafi nasara a tarihi, Ford-Cosworth DFV, ya lashe tseren farko a
Dutch Grand Prix, wanda Clark ke tukawa. Ya sake lashe shi a Birtaniya, Amurka da kuma Mexican Grands Prix; kuma, a watan Janairun 1968, a Grand Prix na Afirka ta Kudu.