Dan Karpinski (9-14) closed out things for Shikellamy, notching a pin with three seconds left in the second period to get past Williamsport's Darren Holloway (6-11).
Selinsgrove got victories from Nathan Bingaman and Andrew Boob. Bingaman (12-14) pinned Shikellamy's Joe Snyder in 3:58 at 152. He faces St. Marys' Alex Feldbauer in the semifinals.
Boob (16-9) defeated Jersey Shore's Domonic Loffredo 7-3 at 182 and will face DuBois' Shane Marshall (28-6) next.
After losing in the preliminary round to Jersey Shore's Spencer Lane, the Seals' Mike Betts (1-15) pinned Vance in 2:31 to stay alive in the nine-man, 160-pound bracket.