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    Holley Vacuum Secondary Diaphragm

    Part # 135-4
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    • Product Details

      Part No. 135-4

      Warranty Details (90 DAY REPLACEMENT IF DEFECTIVE)

      Vacuum secondaries are activated by venturii velocity through the primary venturii and further aided by secondary venturii velocity. Engine/manifold vacuum is not related and has no effect on the operation of the carburetors secondary system.

      Product Features:

      • Vacuum Secondary Diaphragm

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