Originally Posted by cadillacdave1
Definitely an unusual noise. I was thinking it could be a broken damper or 2. Or like the previous post a bad or weak valve spring. Does it chatter in the driveway if u rev it up? If so remove the valve covers and try revving the motor up and see which valve springs are making the noise
Once warmed up it doesn't make any noise at idle, but If I do give it some gas then I do here the noise. More so under a load.