[Chevelle-list] valve tap ?

[Jim & Chris]

I have what sounded like a valve tap,and when I touched the valve cover it felt like a rocker arm was tapping against it so I snugged the rockers , replaced the valve cover and started the motor it was less noisy . when I looked closer I noticed the PCV valve that I had not plugged back in was making the tapping noise. I disconnected the PVC from the vacuum hose while the car was still running,when I put my thumb over the vacuum hose I noticed the vacuum was intermittent causing the PVC to make the tapping noise. What would cause the vacuum to fluctuate so rapidly ? I was using the vacuum port on the back of the carborator for the PVC. sorry about running on.any advice is appreciated. Jimmy C.
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