Billy McConnell completed the full set at Oulton Park as he took the win by more than three seconds after drama on the final lap.
McConnell took the spoils as Alex Olsen, who had led much of the race, was hit with mechanical problems on the final lap.
Brayden Elliott ended up finishing second, just ahead of Davey Todd who passed David Allingham for third on the final lap as Olsen managed to limp home in fifth.
Pirelli National Superstock Championship with MotoNovo Finance: Oulton Park, race result:
1. Billy McConnell (C&L Fairburn Properties/Jackson Racing)
2. Brayden Elliott (CFS Filtration No Bull Racing) +3.024s
3. Davey Todd (Milenco by Padgetts Motorcycles) +3.095s
4. David Allingham (TAG Honda) +3.367s
5. Alex Olsen (FHO Racing by Kobelco) +5.308s