The new VQ37VHR heads are NON SERVICEABLE, meaning you cannot adjust the valves. Typically the FSM recommends changing the oil to Nissan Ester oil for ticking and noise issues, which has been documented on the G37 forums (and on here) to stop the ticking. I hope you're still under warranty, because the only other alternative after this point short of dealing with it is head replacement if your SM deems it is necessary.
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