How many movies have Corey Feldman and Harry Manfredini collaborated on?

They have worked on 4 movies together! Their first movie together was Friday the 13th: The Final Chapter (1984) while their highest rated movie together was Friday the 13th Part VI: Jason Lives (1986). They have not worked together since Friday the 13th Part VII: The New Blood (1988). They are most known for their thriller films together.