After putting everything together, I got this sound. What did I miss? Is this valves slapping against the pistons? Is it possible lifters going bad? It is coming from the passenger side. I followed all the instructions precisely, and am very puzzled!
SEE THE VIDEO AND THE ATTACHED PHOTO.
https://www.youtube.com/watch?v=sPkpLQIihFg&feature=youtu.be
Will go check the timing and lifters again...