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Old 07-25-2013, 09:18 PM
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jsun325 jsun325 is offline
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Join Date: Aug 2008
Boat: MasterCraft ProStar 190 1989 351
Location: Midwest
Posts: 15
Vacuum Gauge to Tune Carb

I've got a '89 ProStar 190 with a Holley 4160 carb. I know the carb can be tuned without a vacuum gauge but using one intrigues me. I've watched the video on the Holley website on using the gauge. They talk about hooking up the gauge to a full manifold vacuum port. The only vacuum port that I see on my engine is the one going to the PCV value. Is this the one I use? Is there another port that I am not seeing? Any insight is greatly appreciated.
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