How many movies have Gangai Amaran and S.P. Sailaja collaborated on?

They have worked on 4 movies together! Their first movie together was Uthiripookkal (1979) while their highest rated movie together was Naalai Unathu Naal (1984). They have not worked together since Andha Oru Nimidam (1985). They are most known for their drama films together.