63 Rear Spring Mounting Plate Bolts - NCRS Discussion Boards

63 Rear Spring Mounting Plate Bolts

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  • Chuck G.
    Extremely Frequent Poster
    • May 31, 1982
    • 2029
    #1

    63 Rear Spring Mounting Plate Bolts

    The 4 bolts that hold the spring mounting plate to the differential, should they be black phosphate or zinc/cad?

    I have several spares, besides the 4 I took off my 63. The ones on the car were zinc/cad.

    I have several "spares" of the zinc/cad type, but I also have 2 black phosphate plated bolts. All have WB headmarks. I think zinc/cad is correct. Any thoughts? TIA. Chuck
    1963 Corvette Conv. 327/360 NCRS Top Flight
    2006 Corvette Conv. Velocity Yellow NCRS Top Flight
    1956 Chevy Sedan. 350/4 Speed Hot Rod
    Tags: None
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    • Joe L.
      Beyond Control Poster
      • February 1, 1988
      • 43193
      #2
      Re: 63 Rear Spring Mounting Plate Bolts

      Chuck-----

      The bolts were the same throughout the 1963-1974 period and were of GM #3833486. I have several NOS examples of these bolts and all are phospate-finished. The original bolts on my 1969 were phosphate-finished, too. It's possible that the finish changed over the years either because the original specs made the finish optional or because the spec for the 3833486 bolt was revised.

      The original bolts on my car had the "WB" headmark. Later SERVICE bolts have other headmarks.
      In Appreciation of John Hinckley
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        • Rick A.
          Extremely Frequent Poster
          • July 31, 2002
          • 2147
          #3
          Re: 63 Rear Spring Mounting Plate Bolts

          Chuck,

          mine are phosphate on LADY
          Rick Aleshire
          2016 Ebony C7R Z06 "ROSA"
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            • Chuck G.
              Extremely Frequent Poster
              • May 31, 1982
              • 2029
              #4
              Re: 63 Rear Spring Mounting Plate Bolts

              Thank you, Joe and Rick. Black phosphate they will be. Chuck
              1963 Corvette Conv. 327/360 NCRS Top Flight
              2006 Corvette Conv. Velocity Yellow NCRS Top Flight
              1956 Chevy Sedan. 350/4 Speed Hot Rod
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