Some lifter tick is normal. Get a dealer to take a look before you shell out for repairs you most likely don't need.
As far as a "known problem"? Doubtful. I'm @ 93K, drive hard and have ZERO issues.
James 1:25 Ordered from Faulkner Chevy #NKCF02 1100 5/8/9 2000, 3300 7/16/9 TPW 7/20,GOT MY (low) VIN! 4000 7/24/9 ,Picked up 8/7/9!!! Signed Litho #45. Car signed by FBodfather 2011. Service: Jennings Chevy in PA. We don't "drift", kiddies... we POWER SLIDE!
MOTM/COTM Sept 2012 Pro Patria Vigilans
Click the pic.. I don't tolerate fools.