My 6.2 developed a noise when the engine stops turning. Sorta' a ka-ching, everybody notices it. Now I've noticed that my '87 Burb sounds a bit noisy in the timing chain(?) area. Hasn't gotten worse in 1000 miles. could anything be loose? I don't believe the motor has ever been touched, (1?)80k. Any thoughts? Sometime in my life I hope to be able to post an audio video link. I have a great clip. Anybody want to help me use a link/player???