You probably got air into the coolant system from gasses entering from a bad head gasket.

As long as you replace the head gaskets, you'll probably be fine.
As long as a cylinder liner did not come loose.

Sorry this had to happen to you.
I slept in my rover for hours with the engine on and the A/C running - to save money on hotels in Boulder, CO. Hotels go up like crazy in June.

 

Yeah, that is just a cooked head gasket sound.
Don't drive it.
Just replace the head gasket.
Look for a groove in the block or head.
You are probably OK - but that blew out pretty quick.


I could not hear liner rap.

There is also a squeak when the engine is turned off.
Fan clutch may be ready to let go.

 

Good job on posting a video!
Yeah, a chunk of the head gasket is gone and the cylinder is losing compression.
You could find the cylinder with a compression test..
But, that's a waste of time.
You have heads to pull off.

Just leave the manifolds bolted to the Y pipe and take out the bolts manifolds to heads - carefully - back and forth as if you try to just remove them and they resist, then the bolts will snap.

 

Here are some pictures.
With summer here, all you need is a parking lot and a good trouble light if you are working at night.

 

Flickr: Landroverdude2's Photostream

 

make that a 3/8 wrench, the 1/2 inch digital I had on the bench won't go low enough for the some of the torques.

Bug spray. sports drink, and a roof is sure handy, plenty of rain delays in my project.

 

just want to thank everyone for all the opinions and input. I'll be starting the project this weekend and see how it goes.

 

Take lots of pix. Confirm any and all torque settings and values. Plastic baggies with note cards help.