Here's my second team with 4 20 game winners. The team was the Yankees in an ATG8 post WWII franchise theme league, $125 mil DH. Not only did the team have 4 20 game winners, but it won 108 games, led the league in pitching and hitting by a wide margin, had a +433 run differential, the highest I've ever seen, had the MVP and runner up (Mantle and Reggie Jackson), had the Cy Young award winner and runner up (Guidry and Ford) and most importantly, beat the alleged 100 win jinx and got a ring!
All in all, a very satisfying season and probably my best team ever.
http://365.strat-o-matic.com/team/1414890