I posted this on another board......
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After I have taken my `06 C6 to My Dealership"s" (My favourite one had to closed when the S**t hit the fan a couple of years ago and to the one that took over their franchise) I took it a Corvette Specialty Garage to have them to see if they could determine a ticking noise when the engine is cold.
They determined is most likely is "Piston Slap".

The first dealership said they could not find anything. The Second dealership said "Yes we hear it but nothing to worry about.

My extended warrant is now over and the Corvette Specialty Garage tell me "To live with it, Put in a New engine or sell the Vette.

No wonder the Dealerships and GM didn't want to address the problem.

Any one else have this problem with their engine? After looking into it further I find it is a fairly common problem.
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This one of the answers I recieved.....

There's no particular bulletin on piston slap for 06 models that I could see.
FWIW here's what the serivce manual has to say.
Engine Noise on Start-Up, but Only Lasting a Few Seconds

Cause & Correction
Incorrect oil filter without anti-drainback feature.
1.Install the correct oil filter.

Incorrect oil viscosity
1. Drain the oil.
2. Install the correct viscosity oil.

High valve lifter leak down rate Worn crankshaft thrust bearing
1.Check the crankshaft end play.
2.Inspect the thrust bearing and crankshaft.
3.Repair or replace, as required.

Damaged or faulty oil filter bypass valve
1.Inspect the oil filter bypass valve for proper operation.
2.Repair or replace, as required.

 

How long does it last for? Can you hear which cylinder(s). If only a few seconds I wouldn't be too worried. That being said it is a big annoyance that GM didn't fix this issue as it seems to be more prevalent on GM engines than others.

 

Good opportunity to tear it down and build a forged engine for boost Gary
Seriously, most dealerships can only work within a scope of what they know the manufacturer will cover under warranty....I've been involved in that for over 25 yrs.....
I had a similar situation with my C5, just before the 6 yr GMPP warranty expired, I took it to 2 dealerships to diagnose a slipping trans, I even left it at WN for a whole week and they had everybody and their friends check it out and said there was no prob with the trans.....this was just as I was putting it away for the winter....when I took it out of storage in the spring, a week after the warranty expired, the trans failed big time! WN offered me no help, I raised hell with GM, had a work order from WN stating trans in good shape with no issues found, and less than 200 km (5 months)later it failed.... I eventually got it covered though....via policy.....
They initially offered to cover parts in I paid the labour, and then labour if I paid the parts....told them I'd go to that corvette specialty shop and get a nice HD RPM trans installed for less....

 

If its really piston slap it pretty common in these engines and not considered a problem really. My car has it for a minute on cold starts. Gone as soon as it warms up a bit. To show you that it is practically a given there is actually a setting in the tune which adjusts timing to try and eliminate it. Believe it or not the setting is called "piston slap". Leave it to GM !!!

 

My 01 Silverado had the same issue when i had it, got the same response from the dealerships. I had the truck for 175,000km's and no problems