Hi Tom,
You want "ported" vacuum off one of the carbs rather than full on vacuum
off the manifold.
>I have finally installed my Jim Carter HEI distributor (HPD150) on my
>'55 235. I am running an Offy dual carb manifold with two 2 barrel
>Holly-Weber carbs. Where do I pick up my vacuum advance? At one of the
>carbs or at the manifold?
"Nothin lasts forever except old Fords and a natural stone" - Willie Nelson
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