63 5 blade fan rivet butt configuration ? - NCRS Discussion Boards

63 5 blade fan rivet butt configuration ?

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  • Tracy C.
    Expired
    • July 31, 2003
    • 2739

    63 5 blade fan rivet butt configuration ?

    In searching for a correct fan for my Late 63 340hp, I've found locally what is reported to be an original 3770529 17 1/8" 5 blade cooling fan from a 63.

    The fan matches the decription in the JG for this part but along with Mushroom shaped rivet heads, it appears the rivet butts also have a "round top" appearance rather than the typical flat butt I've seen on other fans.

    Would owners of known original 3770529 fans on 63/64 cars or other knowledgable folks provide please comment on this feature for my application?

    thanks,
    tc
  • Joe R.
    Extremely Frequent Poster
    • July 31, 1976
    • 4547

    #2
    Re: 63 5 blade fan rivet butt configuration ?

    Tracy,

    Flat butts are the currently available GM replacement fans. The round butts are the original (mushroom) that was on a 63-64 shipped from the factory at St. Louie. Sometimes the Judging Manual leaves a little to the imagination.

    Love those round butts!

    Regards,

    JR

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    • Tracy C.
      Expired
      • July 31, 2003
      • 2739

      #3
      Thank you JR.....must be a J Lo thang! *NM*

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