Turns out it was the idler pully, and the bearing slipped enough to cause some slop (carved out the center of my pully). It really sounded as if it was coming from the SC at first, but friction on the belt was making the SCer feel as if it was internal. I procrastinated too long on the noise until it turned into the most hideous thing you have ever heard, hence the carving out center of pulley.
Sorry no part #s with me right now, just pulled it and took it to a bearing shop for a new one.
However the bearing needed to be welded in place so it wouldn't slip anymore. And now I am in search of a new idler pulley, as it would be "interesting" to get the bearing out again. Did they use a stock pulley? (I don't think they did but can't remember) Anyone know where I could find a pulley?
If there aren't any I may go to a machine shop and have one made in an improved way (but... $$$$$). Since the design of the pulley is that the bearing is off center it caused the wear on the bearing. I would like to see one with either dual bearings or a centered bearing, to prevent the "side load" on the bearing. This is the second time this bearing has gone out on me.
2001 Ironman Daily Driver... 3.5" suspension lift (OME912 springs and 1" spring spacer), ball joint flip, 1.5" front diff. drop, 33"x12.5 TrXus MT, 16x10 Eagle Alloy rims, Interceptor, PV muffler, K&N air filter, Alpine Supercharger, Bilstein shocks, and some trimming.
2000 Ironman Project LS-1 VX... very slow progress but someday....... ohhhhh someday......