Use a long screwdriver and cup your hand around the handle and listen while you put the driver at different points on car. -OR- get a piece of scrap heater hose, one foot or one and half foot, and use it to listen for where the noise is comming from.
Definatly not piston to valve. Valve would bend. Good possibility it is the timing chain hitting the timing cover. If it is be ready for it to jump and fail. It's got to be real loose.
Good luck
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