[aldersonjames20]

You know, this may sound stupid, and is probably completely wrong, but a loose washer or something of that nature bouncing around on metal can give the same sort of noise. It seems unlikely that the valves got out of whack moving the car around the shop, unless they pulled a ferris beuller on you....or just wanted to hear what 9K rpm sounds like from a cobra...

Was the noise heard on both sides or just the drivers side?

James - definately not a mechanic, but I saw an ad for Holiday Express last night.