Engine noise... harmonic balancer? (Anyone have part number for that?)

[HamMach1]

Soon as my Mach hit 100k it started making a new noise. I don't notice and shaking or vibrations, unless it was a gradual onset and I have just been used to it. I don't notice much/any change in driveability but I have been taking it super easy since I first discovered the noise.

It doesn't matter if my AC is on or not, though I do notice my AC causing my car to sorta "hiccup" a bit more than usual as of recently. But it isn't coming from that area as far as I know.

Changed idler pulley and drivebelt so far.


1. At start-up I get an interesting flutter, almost exhaust leak sound near the heads/headers, and only lasts during the start-up motion and goes away

2. Initially the car idles fine

3. After driving the car a bit, a ticking sound occurs. Sounds like a pulley maybe possibly. Changes loudness with rpm

4. A chirping-esque sound occurs under load and goes away on deceleration. Chirp intensity increases as rpm increases. I can usually trigger it in 3rd/4th gear around 2500-2800 rpm, and it occurs "naturally" in 5th when I get around 2100 rpm.

Videos:

Idle (ticking sound)
https://www.youtube.com/watch?v=Mua6Iw1xSqo

Driving (chirping sound... tough to hear, sorry)
https://www.youtube.com/watch?v=0beyKloTnZY (chirping kicks in @ 3 seconds)
https://www.youtube.com/watch?v=CfHcuhwie9k (chirping kicks in after the random clunk @ 6 seconds)

Ideas? Sorry for the long post.

Any the part number for harmonic balancer, anyone have it or a link to a OEM or OEM-like one?