1979 Porsche 930 engine sound

[mic034]

After a short drive, I couldn’t help but notice this sound. After reading different threads on failing timing chain tensioners or valve jobs, it doesn’t quite sound like that to me. So I’ve made a video. I’m contacting my pro-mechanic, but in the interim here it is.

Here’s what I see so far:

Stars/occurs once engine is warm
Definitely on the lower end
Roughly 2,000 miles since full rebuild
It is not a consistent sound
Doesn’t go away after 2,000rpm
Using a wood stick trick, I cant (yet) find it

https://m.youtube.com/watch?v=12g1SpmeK2g

[Schulisco]

An engine cover / air duct plate / heat shield have loosened and is rattling now?
Check the heat exchangers and the exhaust too...probably sth has loosened inside.

[mic034]

Thank you. Good idea about the exhaust and heat exchangers…I haven’t thought of that. I’ll get it on my lift and have a better view of it and use my probe later this week.

[TibetanT]

When I heard this on my car it turned out to be the engine tin was loose, but I am not an expert.
Check the 10mm hex bolts holding the tin pieces together.
Just a guest...and, Good Luck.