i have a turbo on the car, running 6lbs of boost now, and when the aem ems was getting tuned on the dino a noise popped up, it sounds like it comming from the front of the motor. It sounds like loud valve chatter, has any one herd anything like this before. What might it be? I think it might be timing, maybe a cahin or a guide.

 

bent/broken valve stem? is it a knocking sound?

 

It sounds like loud valve chatter, like a tapping. We have done a compression test and a leak down test and showed nothing wrong.