The Dundas Merchants jumped to the OHA Senior "A" league in 1980 from the Niagara & District Intermediate A Hockey League. Until 1984, the league was completely and utterly dominated by Cambridge and Petrolia. In 1981, the team changed their name to the Dundas-Hamilton Tigers. In 1983, the Rockton Real McCoys of the Southern Intermediate B league moved to become the Flamborough Real McCoys and joined the OHA Senior "A" league. A year later Real McCoy sold the team to Motts and the team became the Flamborough Motts Clamatos. After five seasons of domination, in 1984 the Mott Clamatos and the Tigers took Petrolia and Cambridge's spot in the league final. Dundas defeated Flamborough 4-games-to-2. After the season, Dundas was bought by the same company that sold Flamborough to Motts and became the Dundas Real McCoys. In 1986, Dundas and Flamborough met again in the league final, with the Motts Clamatos sweeping the series 4-games-to-none. After the season, the league dropped from seven teams to three and were forced to bring in the Thunder Bay Twins as a fourth member. Motts then moved their team from Flamborough to become the Brantford Motts Clamatos. The 1986-87 season finished with Brantford far ahead in first, Dundas ahead of Thunder Bay in second by a tie breaker, and Cambridge close but in fourth. Brantford met Dundas for the third straight year in the league final and defeated them, going the distance, 4-games-to-3. Brantford went on to win the Allan Cup that year, only to have their sponsor back out and the team fold at the end of the season.