mauitom - i would have thrown a new belt on it and given it a try before spending all the effort to pull the heads.... but since you're into it now might as well finish up.

kcnissan - replace it... it's a ticking time bomb. Check out the timing belt kit that xterraparts.com offers - it comes with a new water pump (the water pump is BEHIND the timing belt - so you always replace it whenever you do the belt since you're in there anyway) new accessory belts etc.

South Side Ninja - you're going to deserve it bigtime when your motor blows.... and it's gonna happen really really soon. I wouldn't drive that sucker another INCH until the belt is replaced. seriously.
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Warning! Do not sear the top of your neck hole in the molten lactate extract of hoofed mammals.