Dsherb27

Hello,
I was recently told that i have a rod knock. My family, friends and i have figured out that i donot have a rod knock. What i know so far is that is either my timing chain needs to be tightened or replaced. And that it only chatters when the engine is cold. It also chatters at high rpm's. I have been reading a bunch of stuff and just not entirely sure what it could be if someone could help me out i would be very happy!

Thanks,
Dylan