JHR Developments' Joseph Loake left it late to secure a double pole position in the first qualifying session of the season at Oulton Park.
The young Brit set a best time of 1m27.958s with his final effort, and was the only driver to break the 1m28s bracket. He headed a JHR 1-2 in qualifying, with teammate Matthew Rees second, 0.180s behind.
Loake's second fastest time of 1m28.027s ensured he also claimed pole for race two.
Rodin Carlin's Callum Voisin was third fastest, just 0.010s further back from Rees, Hitech Pulse-Eight's Souta Arao was a constant presence at the sharp end of the times, and just over half a tenth of a second further back in fourth.
James Hedley put his Arden VRD car in fifth, 0.022s ahead of Douglas Motorsport's Tymek Kucharczyk, with reigning British F4 champion Alex Dunne putting his Hitech car seventh.
Max Esterson was the lead Fortec driver in eighth, just one thousandth of a second quicker than Chris Dittmann Racing's Arthur Rogeon, with Arden VRD's David Morales completing the top-10, which was covered by 0.592s.
In an extraordinarily close session, the top-21 drivers were covered by just 0.972s. 1.101 seconds covered the lead 23 cars with the 25 cars separated by just over two seconds.
With the race two grid formed by each driver's second fastest times, Loake lines up on pole again, and with another decent margin to the rest, this time 0.230s ahead of Voisin, with Arao third.
Hedley, Rees, Esterson and Jarrod Waberski will fill positions four to seven, with Costa Toparis (Rodin Carlin), Kucharczyk and Dunne the race two grid top-10.
The first race of the season is due to commence at 15.00.
GB3 Championship, partnered by the BRDC, Oulton Park
qualifying provisional result (race one grid):
1. Joseph Loake, JHR Developments, 1m27.958s
2. Matthew Rees, JHR Developments, +0.180
3. Callum Voisin, Rodin Carlin, +0.190
4. Souta Arao, Hitech Pulse-Eight, +0.244
5. James Hedley, Arden VRD, +0.405
6. Tymek Kucharczyk, Douglas Motorsport, +0.427
7. Alex Dunne, Hitech Pulse-Eight, +0.504
8. Max Esterson, Fortec Motorsport, +0.542
9. Arthur Rogeon, Chris Dittmann Racing, +0.543
10. David Morales, JHR Developments, +0.592
11. Jarrod Waberski, Fortec Motorsports, +0.646
12. Costa Toparis, Rodin Carlin, +0.677
13. Michael Shin, Hitech Pulse-Eight, +0.704
14. Nico Christodoulou, Arden VRD, +0.721
15. Gerrard Xie, Hillspeed, +0.734
16. Lucas Staico, Douglas Motorsport, +0.787
17. John Bennett, Rodin Carlin, +0.892
18. Ayato Iwasaki, Elite Motorsport, +0.901
19. Oliver Stewart, Elite Motorsport, +0.906
20. McKenzy Cresswell, Elite Motorsport, +0.924
21. Zak Taylor, Chris Dittmann Racing, +0.972
22. Noah Ping, Arden VRD, +1.014
23. Edward Pearson, Fortec Motorsport, +1.101
24. Shawn Rashid, Douglas Motorsport, +1.723
25. Daniel Mavlyutov, Hillspeed, +2.078
GB3 Championship, partnered by the BRDC, Oulton Park
qualifying second fastest times (race two grid):
1. Joseph Loake, JHR Developments, 1m28.027s
2. Callum Voisin, Rodin Carlin, +0.230
3. Souta Arao, Hitech Pulse-Eight, +0.311
4. James Hedley, Arden VRD, +0.403
5. Matthew Rees, JHR Developments, +0.432
6. Max Esterson, Fortec Motorsport, +0.540
7. Jarrod Waberski, Fortec Motorsport, +0.590
8. Costa Toparis, Rodin Carlin, +0.631
9. Tymek Kucharczyk, Douglas Motorsport, +0.635
10. Alex Dunne, Hitech Pulse-Eight, +0.645
11. Arthur Rogeon, Chris Dittmann Racing,
+0.727
12. Gerrard Xie, Hillspeed, +0.730
13. Nico Christodoulou, Arden VRD, +0.763
14. Michael Shin, Hitech Pulse-Eight, +0.768
15. David Morales, JHR Developments, +0.830
16. Ayato Iwasaki, Elite Motorsport, +0.841
17. John Bennett, Rodin Carlin, +0.852
18. Lucas Staico, Douglas Motorsport, +0.908
19. McKenzy Cresswell, Elite Motorsport, +0.918
20. Oliver Stewart, Elite Motorsport, +0.953
21. Noah Ping, Arden VRD, +1.003
22. Zak Taylor, Chris Dittmann Racing, +1.214
23. Edward Pearson, Fortec Motorsport, +1.352
24. Shawn Rashid, Douglas Motorsport, +1.688
25. Daniel Mavlyutov, Hillspeed, +2.034