Time to start the engine and see what we're dealing with.
The very audible tapping at one point in the video is down to few things:
exhaust blowing by
emissions cover blowing by
possibly a stuck valve (it's since gone away)
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0:00 Update
1:00 Cranking the engine
1:50 Do I hear a heartbeat?
2:13 Hours later...
2:55 Another day, another go
4:06 IT LIVES!!!
5:22 Valve trying to escape?
6:05 Final thoughts
8:15 Bonus takes
More at @Maraggie