66 SB ex manifold 3747042 casting # size differences - NCRS Discussion Boards

66 SB ex manifold 3747042 casting # size differences

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  • Russ S.
    Extremely Frequent Poster
    • April 30, 1982
    • 2162

    66 SB ex manifold 3747042 casting # size differences

    I have two 3747042 ex manifolds with different size casting numbers. The one is a little larger and very clear and the other being smaller is clear but not as distinct or easy to read. The larger is dated K9 and the smaller one is dated J25. Is there a difference in the application of these two manifolds namely in which year car they were used? Photo #1 is the larger one.

    TRIED TO DELETE THIS MESSAGE AND COULDN'T
    Last edited by Russ S.; June 3, 2011, 09:27 AM. Reason: delete
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