The 1966 season was significant, as changes to the F1 formula had allowed an increase in engine capacity from 1.5L to 3L. This then was the first opportunity for many teams to test their new cars against top-line opposition.
In the 1966 season, significant changes to the F1 regulations led to a substantial boost in engine capacity, rising from 1.5L to 3L. As a result, numerous teams had the opportunity to test their newly designed vehicles against the best of the best.