OK well let me start from the beginning. First of all, I already think it'* a rod knock. Now to the juicy details:
My gfs bonneville was losing antifreeze like crazy. Of course, it'* the manifold gasket, but she keeps driving it like that. Not my decision. Anyways, eventually she comes out of work one day and her engine won't turn over at all. Fast forward to some idiot trying to start it by jumping it, of course it doesn't work. They tear it down, antifreeze is everywhere, and they clean the top end out. I don't know if they ever cranked it over w/o spark plugs to get the stuff out of the cylinders if it got in there or not. They put it back together and do an oil change, new spark plugs and wires.
When they start it up it'* misfiring a bit, and now there'* a sound coming from the engine when it warms up, and it gets faster as you rev the rpms up.
We drove the car to my place (no choice) and it performed as usual, just with a tapping/knocking sound coming from the front end.
Anyways, here'* the video, is my diagnosis accurate?