spring valve replacement/follow up 2007 Z06 24K Miles.

Received my 07 z06 the other day from the dealer after having the valve spring replaced (left side top chipped). Drove the z home and heard the same knocking sound as before and immediately drove back down to the dealer. They said they would call GM for counsel as to what to do next and to leave it overnight (I was given a free loaner car /good customer service.) The next day I was informed that they need to replace all the valve springs as they may have received a faulty batch or the ones in my engine were no good (keep in mind the Z has 24,000 miles and not a single issue till now (all service performed at the dealer as well) ... I insist that I think it's the bottom end but they claime it's a 'top end problem'. Picked the car up yesterday and whaddya' think happened ? Yep same knocking sound as before. Back to the dealer I go. This time I am a bit preturbed and demand the engine be taken apart. This is where it got interesting/assinine. I was told by the shop manager to drive it anyway and wait for the sound to get worse as the engine has 100k warrenty ... WTF !?! I insisted that they put in writing that it's ok and then immediatly drove to another chevy dealer for a second opinion. They said the same thing. Drive the S _ _ T outta it they tell me till the engine malfunctions . Both dealers told me to drive the car and not to worry. Need some advice here guys. Sorry for the drawn out explanation.

 

Wow, sorry to hear about it. Probably the logical way to handle it is to drive an engine to a grave, and have them to replace it. Also I would negotiate a free towing to dealership from anywhere in USA.
Personally, I would hate to do this, as I respect all my cars and driving a ticking bomb just doesn't make sense to me. Broken valvespring can do many bad things: bent valve, chipped piston, bent rod, etc. My guess you probably have a collapsed lifter... raise a hell and push dealer harder to rebuilt - this is a safety issue, if you throw a rod on high speed.

 

although i think that is pretty terrible. but the valve train is VERY noisy on the z06. if it isn't damaged and two dealers told you not to worry about it, i would call the GM hotline and explain the situation. if they say the same thing then well just drive it.