OIL PUMPS DO NOT CREATE OIL PRESSURE! Rod bearings do however. Start by taking off the timing covers and looking at the belt's condition (missing teeth, jumped teeth) and if all looks well just keep going deeper until you either a)find the problem or b)rebuild the motor and Know that you have a competent platform on which to build a stable engine. Just make sure to measure everything as you remove it, and measure everything during the rebuild and have anything out of spec's machined.-Peace