Max Cook was back on top at the end of Friday at Oulton Park as he led Seth Crump by 0.243secs with his hot lap of 1min 41.300secs.
Dan Brooks ended the day third, 0.454secs adrift of Crump as Aaron Silvester was fourth with Owen Jenner fifth.
Pirelli National Junior Superstock Championship with MotoNovo, Oulton Park, combined practice:
1. Max Cook (Uggly & Co by Binch Pro) 1min 41.300s
2. Seth Crump (Seeeeeth) +0.243s
3. Dan Brooks (R4R Vision Team) +0.454s
4. Aaron Silvester (A&J Racing) +0.859s
5. Owen Jenner (Jenner Racing) +1.090s