DEFINITION
The Crank Balancer Bolt is not OVERTORQUED..You need to get with a mechanic that knows something about the LS1 and LS2 Engines.
The Crank Shaft Balancer and Crank Shaft are not keyed to gether like engines in the past. The Balancer is actually a press fit to the crank. Since this is a press fit, it will not take the torque forces impossed on it. There seems to be a machining defect on the crank shaft end, it maybe a tad bit smaller than it should be, which really compounds the problem. If you let this this go along un-corrected, and by the balancer turns just a little on the crank shaft, there by transferring metal to the crank.....time to change the crank...don't wait for that to happen. What the special washer does is this, it provides new bearing surface for the back of the balancer to the face of the crank..Properly torqued, and that is a must, properly torqued, the problem should be corrected. This problem even exist on LS1 motors, most of the performance builders actually machine key ways where they are suppose to be:
All you need to do is this, hold a screw driver against belt, on the rear side of course, let it tear the belt up a little , then run down to your local dealership and say, hey look here, its coming loose................they will fix it then..don't wait until it happens...will really tear up your car...sure its under warranty, but why wait. The belt is the first thing they look for anyway....
