Name that noise.

My completely stock 71,000 318 2 barrel makes a flutter sound/tick as the motor revs up. It is definitely coming from the top part of the drivers side of the motor, sounds mechanical. I have tried seafoam, marvel oil, and some other **** but nothing has stopped the noise. What is most likely and or some of the possibilities of the source of the noise. Motor runs great and does not smoke or burn oil.