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38 coupe · 07-19-2025, 03:16 PM

I have seen earlier carburetors installed on 8BAs with the vacuum advance tied into manifold vacuum. That results in the opposite of the advance curve you want.
Make sure your vacuum advance is good. Then use the correct carburetor with the advance connected to the port in the carburetor center section.

07-19-2025, 03:16 PM	#16
38 coupe Senior Member Join Date: May 2010 Location: South Texas Posts: 2,040	Re: 49 8BA has no power I have seen earlier carburetors installed on 8BAs with the vacuum advance tied into manifold vacuum. That results in the opposite of the advance curve you want. Make sure your vacuum advance is good. Then use the correct carburetor with the advance connected to the port in the carburetor center section.