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08-20-2023, 01:44 AM
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Registered User
Join Date: Dec 2005
Location: Kalifornia
Posts: 354
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Ported vs manifold vacuum
My 72 C10 1/2 ton has always used ported vacuum per the factory manuals. I'm thinking about trying full manifold vacuum. I read this was done to keep the emissions down when using the smog pump. Don't have the pump installed any longer. Maybe a little smoother idle? Ideas please. SBC 350 and quadrajet.
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