Following his release from Ferrari, Regazzoni opted for a move to the Ensign team. His move to such a small team surprised some, but Regazzoni opted for the small outfit in preference to an offer from Bernie Ecclestone to drive for Brabham, as he preferred "to race with nice people". His season with Ensign, despite managing a points finish on his debut in Argentina, was not successful. Regazzoni finished in the points only a further two times, and ended the season with a total of five points. In May Regazzoni participated in the Indianapolis 500 driving a McLaren-Offenhauser for Theodore Racing. He crashed heavily in practice, but managed to qualify. He finished in 30th place after a fuel cell gave out during his first pit stop.