How many movies have Nizhalgal Ravi and T. K. S. Natarajan acted in together?

They have worked on 4 movies together! Their first movie together was Sadhurangam (1978) while their highest rated movie together was Naan Sigappu Manithan (1985). They have not worked together since Vasalil Oru Vennila (1991). They are most known for their drama films together.