A pair of 14-point quarters (second and fourth) helped the Irish to the win.
St. Vincent-St. Mary led 21-14 at halftime
Bellevue quarterback Jalen Santoro threw for 184 yards and three touchdowns.
Trent Stamm and Dylan Fultz each caught four passes.
Stamm, Dalton Jarvis and Derek Smith hauled in the touchdown receptions.
Parris Campbell ran for 165 yards and three touchdowns for St. Vincent-St. Mary.
The Redmen ended the season at 13-2.
Watch a video of clips from the game by clicking on the player to the right