C1 plug shield mount screws? - NCRS Discussion Boards

C1 plug shield mount screws?

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  • Al C.
    Expired
    • July 31, 1999
    • 274

    C1 plug shield mount screws?

    What kind of head does the "193938 screw assembly"have? What markings and finish?
    In the AIM (1958, sec.6, sh.12) it appears to be an integral "washer" head.
    Does it have a self-locking feature also? Is it the same in all 4 locations?
    ... Al '58 #378 245hp
  • Dale Pearman

    #2
    Re: C1 plug shield mount screws?

    My GM Engineering Standards fastener data calls for a 1/4-20 x 7/16ths pan head slotted with external tooth star lock washer in a plain finish. Part # 193938. The steel was GM 280.

    Dale.

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    • John M.
      Expired
      • January 1, 1999
      • 1553

      #3
      Re: C1 plug shield mount screws?

      Al, On my 60, the fastener was identical to the ones on the oil pan, no head marks, but the head was indented with a little raised ring arround the edge of the head. John

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