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C2 exhaust manifold vacuum

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  • Leonard Gionet
    #1

    C2 exhaust manifold vacuum

    My 66 BB, 427-425 is not idling well and I noticed a small crack or casting flaw in the intake manifold just below the rear left carb stud. I squirted starting fluid at crack and detected a small increase in engine rpm. The vacuum taken at base of carb is 12 Hg. My plan is to put some silicone on the crack and then check vacuum again, however I cannot find specs on what vacuum
    should be , does anyone know?
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