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Can you push down on the rocker arms and they move? If so, the hydraulic lash adjusters were not bled and need to be rebled...which means removing cams and resetting timing. Easy test to see if it is an oiling problem is the just spin engine over without CAS plugged up and look inside oil cap area to see if oil is coming from the oiling rods over the cams. Check oil to head first, then rule out lash adjusters, then last thing would be VTC, if chain is tight.
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