BTW, a buddy of mine expired a rod bearing this weekend.. He's been tooling around on a UD pulley for the past 20K miles. My NA engine had 138K of very hard miles the last 40K and it never flinched. I'll be pulling that engine apart and rebuilding it soon (back to NA spec) and I'm willing to bet that all of the bearings are in excellent shape. There has never been an UDP on it.