Engine noise at idle. YouTube video attached.

[infy]

2955 Avanti with twin 305 v8. Something doesn't sound right. Any ideas?

https://youtu.be/WABTv8EN7kw

In particular I'm talking about the Sha Sha Sha noise. Sounds like a vacuum leak to me.

 

[Pete104]

Sounds more like alt fan to me. Or somethin' flimsy.

 

[H20Rat]

Could be vacuum, but don't rule out something on the belt train. Failing bearings can sometimes sound like that. Remove your acc belt(s) and start it up for a couple seconds to see if it is still there. (don't run more than maybe 15 seconds or so, no water pump turning)

 

[achris]

Best only run the engine with the noise. I may be mistaken, but it sounded like both engines running in that video...

Agree with 'crater, remove the serpentine belt and try again. Noise gone: water pump (either), steering pump, alternator, tensioner bearing or the belt itself.
Another thought, a hole in an exhaust manifold on the underside, near a spark plug. Look for exhaust soot. (if it is, I'll bet it's the hard one the get to )

Chris......

 

[infy]

Great idea with the belt. In the video there was only 1 engine running. I'll have another look at it this weekend.