53-55 Exhaust donut sleeve - NCRS Discussion Boards

53-55 Exhaust donut sleeve

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  • Troy P.
    Extremely Frequent Poster
    • February 1, 1989
    • 1281

    53-55 Exhaust donut sleeve

    On page 61 in the Corvette Central catalog it show a drawing of part 322118, a sheet metal sleeve that goes inside the exhaust manifold and seals to the top of the fiber packing donut. The catalog indicates it fits 53-62. Was this part used in 53, 54, and 55?

    The 53-55 parts book has a 6 cyl gasket flange 2 1/32" ID 3692831, quantity 1, listed and a V8 2" ID gasket flange 3711569, quantity as required, listed. Could these be those parts?

    Interestingly the same parts book lists a packing donut for the 6 cyl but none for the V8.
  • Mike E.
    Extremely Frequent Poster
    • February 28, 1975
    • 5136

    #2
    Re: 53-55 Exhaust donut sleeve

    Don't know that it was used beyond 55 either!

    Comment

    • Scott K.
      Frequent User
      • February 1, 1980
      • 59

      #3
      Re: 53-55 Exhaust donut sleeve

      The sleeve was originally included in the manifold. The replacement sleeve needs to be pressed into the manifold, then positioned into place, followed by the donut. When correctly positioned, the sleeve will protrude slightly from the donut. I'll look for an example image.
      Corvette Central
      800-345-4122
      www.corvettecentral.com

      Comment

      • Troy P.
        Extremely Frequent Poster
        • February 1, 1989
        • 1281

        #4
        Re: 53-55 Exhaust donut sleeve

        I'd appreciate that. I don't recall ever seeing this part before.

        Comment

        • Chris S.
          Extremely Frequent Poster
          • January 1, 2000
          • 1066

          #5
          Re: 53-55 Exhaust donut sleeve

          I have over a dozen original manifolds
          I have never seen one pressed in.........
          1954 Corvette #3803 - Top Flight 2012, Bloomington Gold 2012,
          Triple Diamond Award 2012, Gold Concourse Award 2012, Regional and National Top Flight 2014
          1954 Corvette #3666 - "The Blue Devil" - Pennant Blue - restoration started
          1957 Corvette - FI 3 sp - Black and Silver

          Comment

          • Troy P.
            Extremely Frequent Poster
            • February 1, 1989
            • 1281

            #6
            Re: 53-55 Exhaust donut sleeve

            Does your 57 have one? I'm pretty confident as well that they are not a 6 cly. part but I'm wondering if 55 and up V-8's might have them.

            Comment

            • John H.
              Beyond Control Poster
              • December 1, 1997
              • 16513

              #7
              Re: 53-55 Exhaust donut sleeve

              Troy -

              That sleeve (called an "extension") didn't appear in the A.I.M. as a separate part until 1966. Prior to '66, it may have been part of the front exhaust pipe - I've seen pipes that had it as an integral part of the pipe. Without it, the packing would disintegrate in short order.

              Comment

              • Troy P.
                Extremely Frequent Poster
                • February 1, 1989
                • 1281

                #8
                Re: 53-55 Exhaust donut sleeve

                Thanks for your info, John. Since I have a 55 Corvette to restore I'd still like to find out if it was used in that year.

                When I restored a 55 Chevy Sports Coupe years ago I did not use one. But then again that may have been out of ignorance.

                Comment

                • John H.
                  Beyond Control Poster
                  • December 1, 1997
                  • 16513

                  #9
                  Re: 53-55 Exhaust donut sleeve

                  Troy -

                  The beveled edges of the packing match the angles on the manifold outlet (or the heat riser valve) at the top and the flange on the exhaust pipe on the bottom, and when the stud nuts are tightened, those angles force the entire circumference of the packing inboard; the "extension" supports the inside diameter of the packing and prevents it from crumbling/disintegrating into the exhaust stream. Whether it's an integral welded part of the pipe or a separate part inserted into the end of the pipe, it's required for durability of the packing and freedom from exhaust leaks.

                  Comment

                  • Troy P.
                    Extremely Frequent Poster
                    • February 1, 1989
                    • 1281

                    #10
                    Re: 53-55 Exhaust donut sleeve

                    Makes sense to me. Seems like this would happen with the 6 cyl. set up as well. So do you think there should be two on that car as well?

                    Comment

                    • John H.
                      Beyond Control Poster
                      • December 1, 1997
                      • 16513

                      #11
                      Re: 53-55 Exhaust donut sleeve

                      Originally posted by Troy Pyles (14528)
                      Makes sense to me. Seems like this would happen with the 6 cyl. set up as well. So do you think there should be two on that car as well?
                      Troy -

                      I'm not familiar with the six-cylinder split manifold, but if they have packings, I'd think they also have the "extensions" to prevent the packings from crumbling.

                      Comment

                      • John S.
                        Expired
                        • July 29, 2009
                        • 640

                        #12
                        Re: 53-55 Exhaust donut sleeve

                        Originally posted by John Hinckley (29964)
                        Troy -

                        The beveled edges of the packing match the angles on the manifold outlet (or the heat riser valve) at the top and the flange on the exhaust pipe on the bottom, and when the stud nuts are tightened, those angles force the entire circumference of the packing inboard; the "extension" supports the inside diameter of the packing and prevents it from crumbling/disintegrating into the exhaust stream. Whether it's an integral welded part of the pipe or a separate part inserted into the end of the pipe, it's required for durability of the packing and freedom from exhaust leaks.
                        1955 uses gaskets. i have the early and late manifolds and heat riser combinations and both sides use gaskets. there are no bevel edges on a 55 heat riser or exhaust manifold. there is next to no clearance between the exhaust manifold and the heat riser gate as it opens. no way was there ever a donut, it would interfere with the gate.

                        Comment

                        • Greg G.
                          Frequent User
                          • September 30, 1994
                          • 61

                          #13
                          Re: 53-55 Exhaust donut sleeve

                          I may be wrong but I think the sleeve was pressed into the exhaust pipe and not the manifold.

                          This may be only for the six cylinder cars in 55 and all for the 53 and 54. I think there were just a few six cylinders Vettes in 55 (like maybe 5).
                          Greg Gorniak
                          Member
                          Miami Valley NCRS

                          Comment

                          • John S.
                            Expired
                            • July 29, 2009
                            • 640

                            #14
                            Re: 53-55 Exhaust donut sleeve

                            Originally posted by Troy Pyles (14528)
                            Thanks for your info, John. Since I have a 55 Corvette to restore I'd still like to find out if it was used in that year.

                            When I restored a 55 Chevy Sports Coupe years ago I did not use one. But then again that may have been out of ignorance.
                            troy, your car will use gaskets, no donuts. for car #1074 your exhaust manifolds should both be undated. on the driver side the manifold number will be 3704791, non-ribbed style. passenger side is a 3704792 with a tombstone heat riser(#3713335 on counterweight). gaskets are used on both sides of heat riser.

                            Comment

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