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Vacuum advance question

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01-25-2009, 10:17 AM	#1
KEL 72 GMC Join Date: Feb 2008 Location: Wells, Maine Posts: 534	Vacuum advance question Hey How can I tell if my vacuum advance is working BEFORE I put the distributor back in the truck ? I hooked it up to another vehicle, but I don't know how much vacuum I need to pull before this thing should move. Any help would be appreciated. Thanks guys.

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