[GTLEGEND]

Sounds like a possible vacuum leak somewhere or the timing belt is whining. to eliminate a timing belt, loosen the top timing cover back, spray a little lube on the belt and see if noise goes away. It wont last long as the lube will wear off the belt quickly, but will let you know if thats the concern. The belt can also rub against the metal plate that sits on the crank pulley behind the belt. That needs to be replaced in conjunction with the belt.

Also do the same with the normal drive belts or take off and see if noise is gone. If noise goes it could be the belt(s) or a pulley or the belt being over tensioned and putting load on a pulley bearing.