vacuum leak test on 1980 911sc?

[80TargaSC]

Hi all,
I did a vacuum leak test and found a lot of smoke comming out from the fan.
Please tell me what the leak is that?
See pics below.




Thanks.
Khuong

[PeteKz]

Loose or compromised gaskets between the intake manifold and the heads usually cause smoke to come out of the fan. The smoke around the airbox-to-intake runners may be a cracked airbox.

[80TargaSC]

Originally Posted by PeteKz

Loose or compromised gaskets between the intake manifold and the heads usually cause smoke to come out of the fan. The smoke around the airbox-to-intake runners may be a cracked airbox.

Thank you.