In the season-ending 1990 Reinforced Conference, Purefoods took on Alaska Air Force for the title. This conference featured two imports and Purefoods tapped the services of Daren Queenan and Rob Rose, who replaced Walker Russell during the elimination round. The Air Force took a 2–0 lead with a win away to clinch the best of five series. However, the team of legendary coach Baby Dalupan led a stunning comeback to win the series 3–2, giving the franchise its first PBA title. The championship was Dalupan's last but it made him the first coach in PBA history to win PBA championships in three different decades. The other coach who achieved this feat was Norman Black and Tim Cone.