https://www.youtube.com/watch?v=ppEVO0_uy38

Engine died on the freeway, I looked down and noticed it was just at the top of the heat mark. Occasionally I had the common "no heat from heater" issue so many of us seem to experience, it can last as long as half a minute maybe, it mostly seemed to be an issue when not moving the car (stopped). When driving the heater almost always worked, but this does imply air in the system.

Now the car turns over but won't start, fuel pump kicks in, but it also sounds awful which makes me think what happened is severe. No chocolate milky oil either, it didn't run long upon overheating but I've tried starting it enough times I assume I'd see it dirty if it were the heads. I fear it is worse...

Anyone recognize this awful sound?