98 3RZ Has 1 chain from the crankshaft up to the intake cam.A gear on intake cam turns a gear on exhaust cam. A 2nd chain from crankshaft turns both balance shafts . same setup with a hyd. tensioner. As long as these engines have oil pressure you will in most cases never have a timing issue. It would take alot of doing to convince me that TOYOTA dosn't lead the industry in quality bumper ta bumper! /forums/images/graemlins/wink.gif