Penta 3.0 ('97 Four Winns) air/fuel adjustment -- where is the vacuum port?

[soundquest]

I am attempting to adjust the air/fuel mixture (2bbl Holley Carb on a Volvo 3.0 -- 1997 Four Winns Horizon) and need to know where the vacuum port is on the intake manifold. Thank you.

 

[Bondo]

Ayuh,..... Welcome Aboard,..... Boat motors rarely have a vacuum port,.....

 

[jerryjerry05]

Your best bet, get a FACTORY service manual.
The Clymer and Seloc are ok but nothing like the factory book.

 

[kenny nunez]

If the engine does not stabilize with the metering screws 1.5 give or take 1/4 either way either the carburetor needs rebuilding or something else is wrong with the engine. There should be a pipe thread plug on the top of the manifold that can be removed and replaced with a hose barb fitting.

 

[Scott Danforth]

use an un-lit propane torch and your tach when adjusting AFR