My car has a 360 SB, I cleaned the engine yesterday and just after finish and start the car, I heard a sound like air leak coming from somewhere around the intake manifold.

I already checked and the sound isn't coming from the carburetor air horn, also, the vacuum gauge shows a decrease in the vacuum signal at idle

I made a video where can hear the sound
Link: http://vid1067.photobucket.com/album...pshafgtjbv.mp4

 

j -
Well you have a vacuum leak, no surprise there. Take a squirt bottle full of water and spray around where you hear the noise. When the noise changes, you found your leak. Do all the gaskets, connections, etc.

Archer

 

Or break cleaner ,carb cleaner.

 

While you were cleaning, did you disconnect or break a vacuum hose?

 

just watched the video, is your fuel line ok? Looked like it had kink in it.

 

It should be replaced with a steel line.

 

Get a scrap of hose, fuel hose, garden hose, "hose hose". Put up to your ear, and work the end around the manifold and carb while running. You will find it. There's a leak, there, somewhere

 

Thanks guys!

I did a quick rebuild and inspection, replaced intake, exhaust, heads gaskets and the sound disappeared

 

It's nice when things work out!