Shane van Gisbergen and Anton De Pasquale put Triple Eight first and second as Friday practice came to a close at the Bathurst 12 Hour.
The two Supercars regulars staged a late shootout in the final hour-long session of the day, trading fastest times in the closing minutes.
It was van Gisbergen in the all-Pro #888 entry that ultimately won out, a 2m03.964s - the only time in the 'threes' - proving too good.
De Pasquale finished up two-tenths down in the Pro-Am entry that he'll share with Yasser Shahin, Sam Shahin and Nick Foster,
Kelvin van der Linde was a late improver as well, the South African briefly going quickest in the #222 Valvoline Audi with three minutes to go, before slipping back to third.
Chris Mies made it an Audi three-four in the #22 entry, followed by the #999 GruppeM Mercedes, Raffaele Marciello setting the pace in that car having led the first session, and Ben Barker in #4 Grove Porsche.
The #2 Valvoline Audi was seventh quickest, ahead of the #63 FFF Lamborghini, the #77 Craft-Bamboo Mercedes and the #1 EBM Porsche.
The #6 Wall Lamborghini was the best Silver Class entry, with the previous Silver pacesetter, the #46 Black Falcon Mercedes, sparking an early red flag after Sergey Afanasiev made contact with the wall.
The opening session of practice was interrupted by a brief red flag period, as a mechanical issue for the #12 BEM Porsche's and a barrier collision for the #77 Mercedes left both stricken on track and in need of removing.
Practice continues with another 60 minute session at 8:45am local time tomorrow.