How many movies have Kalthoon Thilak and S. P. Muthuraman collaborated on?

They have worked on 3 movies together! Their first movie together was Oru Oodhappu Kan Simittugiradhu (1976) while their highest rated movie together was Aarilirunthu Arubathu Varai (1979). They have not worked together since Per Sollum Pillai (1987).