Need help with "M" Bolt Head identification - NCRS Discussion Boards

Need help with "M" Bolt Head identification

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  • Keith B.
    Very Frequent User
    • December 1, 1991
    • 397

    Need help with "M" Bolt Head identification

    Please take a look at these bolts. they are the same size as a bumper bolt for a mid year. Disregard the plating as the have been plated by someone. Are these actually M bolts that are 67 intake manifold bolts?
    Attached Files
    Keith Burmeister
  • Lawrence S.
    Very Frequent User
    • April 1, 1993
    • 801

    #2
    Re: Need help with "M" Bolt Head identification

    I have not seen "M" manifold bolts have the circle indentation like that. But I am not a fastener expert..

    Comment

    • Gene M.
      Extremely Frequent Poster
      • April 1, 1985
      • 4232

      #3
      Re: Need help with "M" Bolt Head identification

      Keith
      The intake manifold bolts were generally a grade 5 plated phosphate.

      The bumper bolts were grade 2 without any lines indicating grade strength. In years previous to late 66 bumper bolts were zinc plated. Then they went to phosphate for possibly late 66 and into early 67 and on. These late/early 66/67 cars have been seen with both finishes at opposite ends of the car.

      Comment

      • Bob J.
        Very Frequent User
        • December 1, 1977
        • 714

        #4
        Re: Need help with "M" Bolt Head identification

        Originally posted by Keith Burmeister (20303)
        Please take a look at these bolts. they are the same size as a bumper bolt for a mid year. Disregard the plating as the have been plated by someone. Are these actually M bolts that are 67 intake manifold bolts?
        Isn't a midyear bumper bolt 7/16 and a 67 intake bolt 3/8 ?

        Comment

        • Rich P.
          Expired
          • January 12, 2009
          • 1361

          #5
          Re: Need help with "M" Bolt Head identification

          They are 68-up bumper bolts. All 68 -up bumpers bolts were grade 5 except the two front outer corner bolts that were 3/8-16 grade 8.

          Comment

          • Gene M.
            Extremely Frequent Poster
            • April 1, 1985
            • 4232

            #6
            Re: Need help with "M" Bolt Head identification

            Originally posted by Bob Jorjorian (1619)
            Isn't a midyear bumper bolt 7/16 and a 67 intake bolt 3/8 ?

            Yes, Difficult to tell in a photo if not one of each for comparison.

            Comment

            • Enzo C.
              Very Frequent User
              • January 12, 2012
              • 534

              #7
              Re: Need help with "M" Bolt Head identification

              I'm sure that Rich would help you out... he is the bolt king....
              Enzo Colosimo
              Ncrs Ontario Chapter Chairman 🇨🇦
              ENZ-Z06/67

              Comment

              • Rich P.
                Expired
                • January 12, 2009
                • 1361

                #8
                Re: Need help with "M" Bolt Head identification

                Here are some different font markings for the bumper bolts and for intake bolts. The first picture is of bumper bolts the second picture is of intake bolts you can look close and see every head marking is different. Just a sampling.2016-11-06 16.40.35.jpg
                2016-11-06 16.47.17.jpg

                Comment

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