A team has finished a game with 14-0 runs on that many hits 12 times since 1897, most recently Memphis Red Sox on 24 May 1949. That is about one every 36,917 team-games.
Box score for the most recent one ↗
12-1 12-2 12-3 12-4 13-0 13-1 14-0 14-1 14-2 15-0 16-0 16-2 16-4