How many movies have K. Somu and Sivaji Ganesan collaborated on?

They have worked on 4 movies together! Their first movie together was Makkalai Petra Magarasi (1957) while their highest rated movie together was Sampoorna Ramayanam (1958). They have not worked together since Naan Vanangum Deivam (1963). They are most known for their drama films together.