In a thrilling finale to the second race, Courtney claimed victory by just 0.76 seconds as the two drivers produced a titanic tussle over the last 20 laps.
Van Gisbergen even bumped his way past Courtney at one stage but let the HRT driver regain the lead in case he was penalised.
Garth Tander complete a full podium for the Holden drivers.