Well, I unbolted the TC, pushed it back and got happy: One of the flexplate bolts was loose. So I thought: Good thing, saved a lot of time and money. So I tightend it back down, started the engine and got sad: Nothing changed, the clanging is still there. The flexplate also doesn't seem to be bent or cracked, I inspeced it very carefully, as carefully as I could with it installed and with the aid of a good handlamp. Anyway, two things: The noise doesn't sound the same as if a bang on the flexplate with a small hammer, it doesn't ring like the fp, it's more of a clacking sound... Second: Only one bolt of 6 was loose, I don't think that would make a noise that loud...
I have also checked for loose headers (that's not the case) and waterpump is going to be checked soon. But I fear it's something "internal"
What rotating assy would you suggest? Go with GM parts or more like Scat or Eagle? Would I need a steel crank or would iron do the job? remember: heavy car, fun-style of driving.
Many thanks to all of you,
Max