In addition, Siffert was chosen by Porsche to help launch its CanAm development programme, driving a Porsche 917PA spyder in 1969 and finishing fourth in the championship despite few entries.
Ademais, Siffert foi elixido por Porsche para axudar a lanzar o seu programa de desenvolvemento CanAm, pilotando un Porsche 917 PA spyder en 1969 e terminando cuarto no campionato malia poucas participacións.