Valvetrain noise with a hydraulic roller??

[dhardison]

In the continuing saga to get my 572 to run correctly I installed a full MagnaFlow exhaust this past weekend (so the neighbors would stop calling the cops). Previously the exhaust was so loud there was no way to hear the now VERY apparent valvetrain noise.

It's the factory hydraulic roller cam with GM roller rockers. Now that the exhuast is quiet I can hear what sounds like the rockers 'rattling'. In the recent past (when the exhaust was loud) I checked valve lash and made sure the rocker lock nuts had not backed off from the factory (they're marked with paint). Everything looked good at that time.



This is my first roller cam/rockers, are they notoriously noisy? Loud enough to hear them from inside the car?

Thanks,
Dan