Engine noise

[c10ryder]

Help.
Yesterday after an 80 mile drive in Central California my engine made this noise, the truck ran fine the entire time oil is good and clean no over heating so I'm a little concerned about this. Can anyone point me in the right direction? I took a video of what happened when I pulled into the garage. Today I started it a few times and no noise

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[DoubleDingo]

That's a new one for me. Only thing I can think of is pressure build up in the cooling system and it was going passed the radiator cap causing the noise.

 

[fast 99]

Disconnect and plug the brake booster temporarily. Whistle noise?

 

[Rusty Nail]

I would look at the water pump.
Cooling system.

 

[TJ1978]

Spun bearing,or dying elf but it sounds like pressure escaping when shut down