Hard to say with out hearing it, change oil, pull the plugs wires off one by one to hear a change. Take a large screwdriver to isolate the area-hold the handle on your ear, pull a valve cover off and check for bend pushrods, loose rockers. My 2002 5.3 when it was new had lifter tick noise when hot, a cam and new adjustable rockers took care of it. How many miles on the engine? What weight of oil? Never was a fan of the W5-30 water they say is oil.


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