Yuck...what do you think was wrong with this junkyard pickup truck?

Sounds to me like it may have had a major exhaust leak 🤔.
[youtube=https://www.youtube.com/watch?v=VhIFu7G4h04]

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It may be more than that.That exhaust could be covering up other noises in the valvetrain.Sounds like it may be a bit low on oil.