Jordan Hall struck twice for the Knighthawks (11-5) while Scott Campbell, Jon Sullivan, Stephen Keogh, Craig Point, Dan Dawson and Paul Dawson added the others.
Joel McCready led the Stealth (5-11) with five goals and an assist. Rhys Duch had a goal and six helpers, Logan Schuss scored once and assisted on five others and Tyler Digby added a pair of goals and two assists.
Rochester's Matt Vinc made 42 saves for the win. Vancouver's Eric Penney stopped 36-of-48 shots in defeat.
The Knighthawks went 3 for 5 on the power play while the Stealth scored twice on three chances with the man advantage.