Timing belt is every 90K easy to do IMO I love those they pay good. make sure you replace the oil pump seal, water pump, crank seal, and cam seals, there too cheap not to replace them even when you got everything apart, also CHECK THE TENSIONER, I would replace them but alot of people dont if its not leaking and has good tension. Also might as well replace the drive belts, remember you got all this apart migth as well pay to get everything replaced its ALOT cheaper to do it now, plus you wont have to worry about it anytime later. You take care of the motor it will take care of you.