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This is normal. I had my dad (who is the service manager at a Chevy dealer) check into this a year or two ago. We found an LS3 on the lot, fired it up and sure enough, had the same noise as mine.
Checked into the dealer records database for any other incidents and found one dealer who replaced the entire transmission and all related parts (clutch, flywheel, housing, etc. etc.) and the car made the exact same noise when it came down off the lift (apparently, this is just what I was reading in the database).
Anyway, it appears to be normal for these cars. Mine has done it since day one and I don't really even notice it anymore.
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2011 Chevrolet Camaro SS2/LS3 - Pretty much bone stock (SLP SkipShift Eliminator, GTO clutch fluid reservoir mod) - 13.025 @ 110.492 MPH (12s??  )
1998 Pontiac Grand Prix GTP (retired) - Cam, exhaust, CAI, 12 PSI, tune - 13.465 @ 101.04 MPH |