Originally Posted by Franc Rauscher
I tend to agree. Alterntor or a pulley rubbing something.
I get the same sound if my CIA comes loose and touches the Serpentine belt.
The fact that he has no loss of drivability suggests something simple. Outside the engine.
roadster with a stick
Agree with these guys......... sounds like something vibrating or loose, not in the engine (given how you described sound and drivability). Pully, fan, belt, etc. I would give externals a good going over first. Hope it's something simple.