On a freshly restored tri-power I had a a similar problem after opening the outboard carburetors.
I had to add a heavier duty torsion spring (from a 4bbl) on the rear carb so that the outboard carburetor butterflies would close completely. You need sufficient spring pressure to return all the butterflies to idle. Mike told me I can tweak the lighter duty spring to get some more strength out of it too. |
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Idle vac is also about 17in/hg, which seems too good for a major vac leak. Maybe not? |
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