[Hib Halverson]

It's too bad the mic was not down lower closer to the exhaust and also closer to the engine. That is...two different recordings.

I've played that footage a couple of times. Once with the volume as loud as my computer could go. It's really hard to tell but I think I could hear a "dead miss" in the exhaust in sync with that bad rattle from the engine.

Without better audio or a stethoscope session, I'll make a wild-assed guess that a valve lifter(s) have failed. The engine has a stuck, bent or broken valve.

It would be great to find out of the rattle is coming from the engine or the clutch housing and if from the engine, which bank.