I know this has been asked before, but is it considered normal on a Z06 to have some valve noise? I can sit in the car and @ idle I can hear a tapping noise that goes away @ higher rpm's ,like a lifter/tappet sound. This car makes different sounds that my 2000 coupe and I'm just not sure whats normal for a Z ! also when I let the clutch out and leave it in neutral the rattling is loud and @ other times its not to bad. any input is appreciated.
these noises are driving me

these noises are driving me