He may have spun a rod bearing. Change the oil and filter and hope the noise goes away. If the noise gets louder or the oil pressure light comes on later, you know the engine is toast. If you're lucky, the hydraulic lash adjusters just got some air in them. The bleeding procedure involves warming the engine to operating temperature and slowly increasing the engine revs to 3500 over the course of 30 seconds and slowly bringing the revs back down to idle speed the same way and repeating until there's no more ticking.
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