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Terry,OH · 08-23-2016, 06:25 AM

The 81A intake manifold has two vacuum ports one on the RH front for the distributor vacuum brake that slows mechanical advance. The second is RH rear for the windshield wiper. Is the port under the Carburetor something you added?? Do you have the wiper vacuum port?

08-23-2016, 06:25 AM	#14
Terry,OH Senior Member Join Date: May 2010 Posts: 5,186	Re: Need help to set idle The 81A intake manifold has two vacuum ports one on the RH front for the distributor vacuum brake that slows mechanical advance. The second is RH rear for the windshield wiper. Is the port under the Carburetor something you added?? Do you have the wiper vacuum port?