Here's the latest on my 2001 with the knocking noise. I dropped it off at the dealership on Monday to get the lifters changed in it. Well come to find out a few hours later someone else brought in their vette for the same problem. The dealership then called one of the corvette gurus and to make a long story short they didn't change the lifters, what they did was a top end cleaning to bust up the carbon. Just as c4c5specialist said would happen. Well it fixed the problem and there is no more knocking. She sounds sweet now!! :dance My only concern was that this build-up happening with less than 10,000 miles, would it happen again soon?? Of course I use nothing but 93 octane, so I guess time will tell. Hope this helps some and thanks for the help from the others!