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scooder · 08-24-2016, 07:42 AM

David,
That "vacuum" port by the oil fill tube is NOT a vacuum port. That is the engine end of the crankcase ventilator that was fitted to some military stuff. Your manifold is a Canadian war time job.
The vacuum ports should be on the back of the manifold riser just below the carb, I believe. I can check later when I get home as I have this manifold.
Vacuum leaks can occur at the valve chamber side of the inlet ports, had this happen, no amount of spray stuff will find these ones. Only manifold removal.
Martin.

08-24-2016, 07:42 AM	#22
scooder Senior Member Join Date: Jul 2010 Posts: 2,595	Re: Need help to set idle David, That "vacuum" port by the oil fill tube is NOT a vacuum port. That is the engine end of the crankcase ventilator that was fitted to some military stuff. Your manifold is a Canadian war time job. The vacuum ports should be on the back of the manifold riser just below the carb, I believe. I can check later when I get home as I have this manifold. Vacuum leaks can occur at the valve chamber side of the inlet ports, had this happen, no amount of spray stuff will find these ones. Only manifold removal. Martin.