1969 Engine Mounts - need some help / advice - NCRS Discussion Boards

1969 Engine Mounts - need some help / advice

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  • Kevin S.
    Very Frequent User
    • January 5, 2011
    • 255

    #31
    Re: 1969 Engine Mounts - need some help / advice

    Hi Patrick,

    I did not know that a reproduction later style bolt kit existed? Where might I find that?

    Today, per Joe's additional detailed size and finish, I went back to the Bolt Depot website and ordered (2) 7/16" - 14 x 4 1/2" long, grade 8, hex head zinc-plated bolts. I can strip these and manganese phosphate (black) finish these to correct finish even though they are 1/16" longer and they do not have the pilot tip. I might be able to modify the tip and create a pilot tip with my Dremel. The Bolt Depot did not have bolts with a "pilot tip". They (Bolt Depot) directed me to McMaster-Carr and thought they might have a pilot tip option but they do not offer "pilot tip" options either.

    Bolt Depot did have (2) "Stover type" prevailing torque lock nuts, grade 8, zince finish, 7/16" - 14 thread count so I bought those. These are an exact match to what Joe described in his details.

    Still have a question on the Stover self-locking nuts? Should I use blue threadlocker, anti-seize, or just leave them alone and torque to spec based on AIM P. 201, UPC 6, B3, Engine Front Mounting, item number 2, PN 272876 Nut, torque spec 25 - 35 Ft Lbs. My intuition tells me to use the blue threadlocker even with a Stover type prevailing self-locking nut.

    Kevin

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    • Patrick H.
      Beyond Control Poster
      • December 1, 1989
      • 11643

      #32
      Re: 1969 Engine Mounts - need some help / advice

      Originally posted by Kevin Saxton (52665)
      Hi Patrick,

      I did not know that a reproduction later style bolt kit existed? Where might I find that?

      Kevin
      https://www.corvettecentral.com/c3-6...eadmark-303363
      Vice-Chairman (West), Michigan Chapter NCRS
      71 "deer modified" coupe
      72 5-Star Bowtie / Duntov coupe. https://www.flickr.com/photos/124695...57649252735124
      2008 coupe
      Available stickers: Engine suffix code, exhaust tips & mufflers, shocks, AIR diverter valve broadcast code.

      Comment

      • Leif A.
        Extremely Frequent Poster
        • August 31, 1997
        • 3627

        #33
        Re: 1969 Engine Mounts - need some help / advice

        Not sure the length of the bolts from Corvette Central, but the ones from Zip are 4 7/16" pilot point, "A" headmark, black phosphate, Grade 8.
        Shop for 1970-1982 Corvette Engine Mount Frame Bolts (Correct) at Zip, your source for C2 & C3 Corvette engine mounts & reproduction mounting hardware. (GM Part 399803, 9422299)

        Leif
        '67 Coupe L79, M21, C60, N14, N40, J50, A31, U69, A01, QB1
        Top Flight 2017 Lone Star Regional

        Comment

        • Kevin S.
          Very Frequent User
          • January 5, 2011
          • 255

          #34
          Re: 1969 Engine Mounts - need some help / advice

          Hey Leif & Patrick,
          Thanks for the links and info on the long through-bolts for the locking-style engine mounts. Corvette Central and Zip are identical 7/16" - 14 x 4 7/16" black phosphate, pilot tip, "A" head marks, grade 8 bolts.

          Thank you.

          Kevin

          Comment

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