Jon Caul and Mark Rideout both scored twice for the winners, whose Kyle Downer stopped 26 of 29 shots faced. Mike Druken, Jacob Lewis, and Cody Squires added singles for the Caps.
David Byrne scored all three Blues’ goals with Daniel Noftle drawing assists on each. Evan Giles was peppered with 41 shots in net for Bell Island.
The best-of-seven final gets underway next Friday night, 8 o’clock, at the Jack Byrne Arena, with Game 2 set for Saturday, 7:30 p.m., at Rogers Bussey.
In the six head-to-head meetings during the regular season, the Eagles won on five occasions.