In 1983, the OHA Senior A Hockey League absorbed the Major Intermediate A Hockey League, nearly doubling the league's size. In 1986, the league shrunk down to three teams, added Hockey Northwestern Ontario's Thunder Bay Twins as a fourth team, and then folded after the season. The OHA Senior A league spawned four Allan Cup champions from 1979 until 1987. The final season was finished off in style, as the league champion Brantford Motts Clamatos went on to win the Allan Cup as National Senior "A" Champions.