How many movies have M. S. Viswanathan and R. G. Gopu collaborated on?

They have worked on 4 movies together! Their first movie together was Anbe Vaa (1966) while their highest rated movie together was Kasethan Kadavulada (1972). They have not worked together since Kasethan Kadavulada (1972). They are most known for their drama films together.