Cars have hit the track at Winton Motor Raceway on Friday for official pre-season testing.
Official running for the 2021 Repco Supercars Championship is underway, with the rural circuit hosting Victorian-based teams.
CLICK HERE to follow live timing.
Pre-season testing will be held across two different dates at separate venues in 2021.
Last week, Queensland-based teams took to Queensland Raceway, with Matt Stone Racing's Zane Goddard topping the times.
Neither day will be televised, but official pre-season testing can be followed with Supercars.com's live timing.
Cars will be on track at Winton from 0900 AEST.
The tests will mark a crucial opportunity for teams and drivers to prepare for the upcoming season.
Through the opening 45 minutes, David Reynolds was atop the time sheets with a 1:20.0714s in his new Kelly Grove Racing Mustang.
Reynolds set his quick lap on his eighth tour of the morning.
The 2017 Bathurst winner was 0.1232s ahead of Tickford Racing's Cameron Waters.
The 2021 season will commence at the Repco Mt Panorama 500.
Tickets for the event are on sale now.