slight knock on engine

[red67]

hey fellas
i have a slight knock on my engine
you can hear it on the video below

its not valves - its further in the centre of the engine
feels like it is below the fuel injection but above the engine
does anyone know what this could be?
its on a 1976 2.7 911S with 100k miles on the clock

thanks for any advice beforehand!
Paul
https://www.youtube.com/watch?v=Qu-UweDKalY&feature=youtu.be

[Discseven]

I can hear the sound. Don't know what it is. Men er morsomt at se en dansker i Pelican. Brugt min ungdom i København med min Grandmom. Derefter giftede sig med en pige i Århus.

If no one comes up with an answer for you, call George at Miami Porsche Service and Repair (GP Auto Werks) in Miami. Ask if you can send him the link to the vid. He's got 37 years of Porsche experience----and knows the older model engines quite well.