I personally on both my Gen1 V6 never had a bolt come loose... don't know if it's just good luck, or because I work on my stuff enough and have a system of tightening my bolts. I use Brendan's method of sacrificing a serpentine belt and feeding the belt around a pulley then looping it into itself. I forget the torque specs but I think I just goto 130ftlbs. I put about 15k on my Montero with the original style bolt before my head gasket went. <img src="/forums/images/graemlins/zombie.gif" alt="" />

Richard E
1989 Montero - Stock-ish
1989 V6 Auto Raider - 5.3 Vortech Swap.
1987 Mitsubishi Starion 2.6t, soon to be 3.5
1983 Honda XL600R