1999 5.4 Cold Start Rattle - Timing chain?

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Jackie_Moon

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See video: https://youtu.be/ABVB7Th64v0

As the title suggests, my Expy (219k on the clock) is rattling during cold starts. This time it occured about 1min after the cold start. Sometimes it occurs immediately after starting. It always goes away after idling for a few minutes or driving and getting it up to temp, and doesn't occur when starting hot.

Timing chain?

edit: I should add that the engine is running perfectly fine - not misfiring or anything.
 
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