1967 327/300 A/C Upper Alternator Brace - NCRS Discussion Boards

1967 327/300 A/C Upper Alternator Brace

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Kent K.
    Extremely Frequent Poster
    • December 1, 1982
    • 1139

    1967 327/300 A/C Upper Alternator Brace

    There have been several posts regarding the upper alternator brace on 1967 small block Corvettes. To my knowledge from information received from the (only) three previous owners, this tracing is from the original brace installed at St. Louis on my mid-production run 327/300 A/C Corvette. Images provided here and in the next post are the best I can provide with limitations present. Hopefully, this will help those who have questions or are looking through swap meets for the correct brace.

    Bolt information may only be correct for my car but may be a guide for others:

    Lower Bolt --- through upper, lower brackets and water pump (in that order) into engine block is a Grade 5, mfr. P, 3/8" dia. with 9/16" hex head. Threads extend approx. 1" and are 16 per inch. Overall length including threads and shank is 1 7/8" long. Cadmium plated. There is a washer but, after removing it twice, I forgot to take notes. Most likely, it is a plain washer.

    Upper Bolt --- through star and plain washers, through bracket and into alternator. Bolt is 5/16" dia. with full threads (18 threads/inch.), about 1" long with a 1/2" hex head identified as a recessed head with WB mfr's marking. External tooth washer with flat cut tooth ends and a 7/8" dia. plain washer, approx. 1/16" thick. Cadmium plated.

    If these two images are insufficient for you, please email me for my address. Then I would ask you send me a SASE for a full copy (legal size paper). My scanner is for letter size paper only.

    Second image to follow.

    Regards,
    Kent Keech




    Attached Files
    Kent
    1967 327/300 Convert. w/ Air - Duntoved in 1994
    1969 427/435 Coupe - 1 previous owner
    2006 Coupe - Driver & Fun Car !!!
    NCM Founder - Member #718
  • Kent K.
    Extremely Frequent Poster
    • December 1, 1982
    • 1139

    #2
    Re: 1967 327/300 A/C Upper Alternator Brace

    Second image.

    Like Jerry,
    Having fun.
    Kent Keech




    Attached Files
    Kent
    1967 327/300 Convert. w/ Air - Duntoved in 1994
    1969 427/435 Coupe - 1 previous owner
    2006 Coupe - Driver & Fun Car !!!
    NCM Founder - Member #718

    Comment

    • Joe L.
      Beyond Control Poster
      • February 1, 1988
      • 43193

      #3
      Re: 1967 327/300 A/C Upper Alternator Brace

      Kent------

      The brace that you have depicted appears to be a GM #3884640. This brace was used, at least, for 1967 small block applications without C-60. The AIM indicates brace GM #3854028 was used for C-60 applications. Among other differences, the slot length for this brace was 2-7/32".

      However, while PRODUCTION information from the AIM indicates that the GM #3854028 was used for 1967 C-60 small block applications, SERVICE parts information indicates otherwise. SERVICE parts information indicates that the 3854028 was last used for the 1965 model year for certain small blocks with C-60. According to SERVICE parts information, the GM #3884640 was used for all 1967 300 hp applications, regardless of whether or not C-60 was also installed.

      So, in this case, there is a conflict between the AIM information and the SERVICE parts information. Based upon what you've found, I strongly suspect that the SERVICE parts information is correct.
      In Appreciation of John Hinckley

      Comment

      • Kent K.
        Extremely Frequent Poster
        • December 1, 1982
        • 1139

        #4
        Re: 1967 327/300 A/C Upper Alternator Brace

        Joe,

        Thanks for the feedback. I see the AIM calls for #3854028. What are the other differences between GM #3854028 and GM #3884640? Could it be that the line ran out of #3854028 and substituted #3884640 when my car rolled through? Are differences so great that the substitution was uneventful? Where do you obtain dimensions/specifications for such parts?

        Regards,
        Kent Keech
        Kent
        1967 327/300 Convert. w/ Air - Duntoved in 1994
        1969 427/435 Coupe - 1 previous owner
        2006 Coupe - Driver & Fun Car !!!
        NCM Founder - Member #718

        Comment

        • Joe L.
          Beyond Control Poster
          • February 1, 1988
          • 43193

          #5
          Re: 1967 327/300 A/C Upper Alternator Brace

          Kent-----

          The length and offset between the two braces is very similar. However, I do not have information on possible angularity differences between the two. My strong suspicion is that the 3884640 was used for many, most, or all 1967 with 300 hp and C-60. I can't say that for certain, though.
          In Appreciation of John Hinckley

          Comment

          • Gerard F.
            Extremely Frequent Poster
            • June 30, 2004
            • 3803

            #6
            But The one Joe R and I have is shorter

            Kent,

            Same slot length but +/- 13-3/4" across the diagonal, outside to outside. From the center of hole at the bottom to the center of the hole in the slot as you show it, Joe Randolph's tracing measures +/- 12-5/8" (where you show +/- 13-7/8".

            Maybe ours came off a Ford.

            Having fun,

            Jerry Fuccillo
            #42179
            Jerry Fuccillo
            1967 327/300 Convertible since 1968

            Comment

            • Kent K.
              Extremely Frequent Poster
              • December 1, 1982
              • 1139

              #7
              Re: But The one Joe R and I have is shorter

              Jerry,

              My BAD, eyes-brain can't seem to remember to drop 1", 2" or 3" when measuring. The actual dimension from center to center should have been 12 7/8" (+/-). Thanks for correcting me. Taint from a FURD!!!

              If you read Joe's post, there could be something awry in his parts manuals. And the assembly line may have used this bracket on A/C cars instead of the intended bracket. But, who's to know for sure unless we gain more knowledge from untouched original '67 A/C Corvettes.

              Regards,
              Kent Keech
              Kent
              1967 327/300 Convert. w/ Air - Duntoved in 1994
              1969 427/435 Coupe - 1 previous owner
              2006 Coupe - Driver & Fun Car !!!
              NCM Founder - Member #718

              Comment

              • Gerard F.
                Extremely Frequent Poster
                • June 30, 2004
                • 3803

                #8
                That's close enough

                Kent,

                I guess we all have the same one within measuring tolerances

                There is no part number on them and I can hear the assembly line worker saying "Oh yea, that's the small block one!"

                Wonder if it has to do with the order of assembly? Which came first, the alternator or the C60? Maybe that's the key to the mystery.

                Jerry Fuccillo
                Jerry Fuccillo
                1967 327/300 Convertible since 1968

                Comment

                • Barbara S.
                  Very Frequent User
                  • April 30, 1981
                  • 599

                  #9
                  Re: 1967 327/300 A/C Upper Alternator Brace

                  Here's a photo of mine from the restored survivor that I completed last year. 1967 327/300 with C60.

                  Hope this helps.
                  Tony
                  Attached Files

                  Comment

                  • Barbara S.
                    Very Frequent User
                    • April 30, 1981
                    • 599

                    #10
                    The photo *NM*

                    Attached Files

                    Comment

                    • Joe R.
                      Extremely Frequent Poster
                      • March 1, 2002
                      • 1356

                      #11
                      Re: The photo

                      Hi Tony:

                      Glad to see that you can post photos now. I know you have some great ones in your archive. This particular photo is of the A/C bracket, not the alternator bracket, but it's a great photo nonetheless.

                      Comment

                      • Joe R.
                        Extremely Frequent Poster
                        • March 1, 2002
                        • 1356

                        #12
                        Re: The photo

                        Oops, my bad. I didn't realize that I could scroll over to see the alternator brace!

                        Comment

                        Working...

                        Debug Information

                        Searching...Please wait.
                        An unexpected error was returned: 'Your submission could not be processed because you have logged in since the previous page was loaded.

                        Please push the back button and reload the previous window.'
                        An unexpected error was returned: 'Your submission could not be processed because the token has expired.

                        Please push the back button and reload the previous window.'
                        An internal error has occurred and the module cannot be displayed.
                        There are no results that meet this criteria.
                        Search Result for "|||"