Labbe was able to make the pass around Kennington on Lap 75 and then hold the two-time series champion off in overtime to pick up the win in the first doubleheader for Canada's national stock car championship.
DAMS recorded their maiden GP3 Series victory thanks to a commanding performance by Jake Hughes at the fifth round of the 2016 championship at Hockenheim.
Swiss racer Kevin Joerg was DAMS' highest-placed finisher over the weekend as he turned 11th place in qualifying into a points-paying 10th spot in Race One; close to an eighth place that would have given him pole position on the partially-reversed Race Two grid.
French team DAMS has chosen a line-up of three impressive newcomers as it embarks upon its first season in the GP3 Series in 2016 with Jake Hughes, Kevin Joerg and Santino Ferrucci.