I hate to even ask........

.......about engine noises. But before I start tearing things apart, maybe someone else has had this noise.
I got into the car hard the other day (1st, 2nd and 3rd manual) and after I shut it down and stopped at a light I heard a knocking. Not a hard knock, but something lighter, associated with engine rpm, faster I rev faster the knock.
So I stop, raise the hood and listen. I comes from the upper r/s of the motor and it is like a squealing/tapping sound.
Oil is level and clean. No overheating. 93 Oct gas.
I might try a video/audio clip later. It is a 380hp Magnum crate engine. Bout 8K on it. And yes it was warm when I punched it. Actually had driven it 10 miles before I gassed it and started hearing the noise.
Any input is certainly appreciated guys.