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Click on each of the following to play. You're listening for the sound that doesn't sound normal!
A clatter is the best way I can describe and it is more prominent under load (not idling).
It's not valve tapping (HLA noise)

I'm also getting some white smoke out of the exhaust when revving or between high-rev shifts while driving.
There are two movies and an audio file:


This picture shows where oil is leaking out between the header and the engine block.
It kind of bubbles out like a baby spitting