Hmmm, I guess it could be the valves...
Are you sure its not a bit of detonation?
I would take it to another dealership and have someone else take a look, as a noise like that isn't normal as far as I know...
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"The Yellowjacket"
381.8 rwhp 377.6 rwtq
"Never underestimate the power of stupid people in large groups."