[Chambers]

Originally Posted by rstutler

...Oh, it doesnt sound like anything pounding really, more like an highly audible tongue clicking sorta sound? (bad choice of words...)

I know exactly what you mean by that sound. My car has a "knock" that you can really only hear in that rpm range. I had my father take a home made stethoscope (a piece of small diameter pvc pipe, lol) and listen around the engine while I held it around 2000rpms. He tracked down the sound coming from the exhaust side cam, cylinder 3 or 4. I took a listen and it was defiantly louder on the exhaust side right in the middle of the engine, length wise.

The valve train in the Supra basically has shims that the cam lobes push down opening the valves, if they wear incorrectly that could very possibly create the "knocking" sound. I haven't had a chance to take the valve cover off my car yet to see if it is a shim, but its something I plan to do soon.

Hope this helps a little, it's at least a place to look.