Engine: Blue top F20B Dohc Vtec

Getting almost like a rattle/tapping noise coming from the cylinder head. More noticeable at cold start ups. When fully warm the noise does calm down, but its still there. The engine has full compression. Auto tensioner was replaced not to long ago(apparently that causes common engine noise). Reving engine between 3-4k rpms when cold, really makes the noise apparent. As i said engine has full compression, and doesn't appear to have performance loss.

 

Was checked for valve adjustment, and they are all in spec.