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Thanks everyone for your input -- really appreciated. I guess it must be engine knock I'm hearing after all. It sounds like this is a fairly common problem with late model LS V8's. Out here in Southern California I'm mostly limited to 91 octane fuel, so I guess I'll have to try an octane...

Hello all, I'm a new owner of a lightly used 2006 LS V8 with 6,000 miles. I hope someone can help me out... I've noticed a pinging noise coming from the engine under hard acceleration between about 4k and 5k RPM. It doesn't sound like engine knock (I've tried using different brands of high...