EGR Intake Manifold on 71 or 72 Corvettes - NCRS Discussion Boards

EGR Intake Manifold on 71 or 72 Corvettes

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  • Bruce N.
    Expired
    • March 23, 2008
    • 83

    EGR Intake Manifold on 71 or 72 Corvettes

    Does anyone know if any of the 350 cubic inch, 270 horsepower motors were built with EGR intake manifolds?
    Thanks.
  • Edward J.
    Extremely Frequent Poster
    • September 15, 2008
    • 6940

    #2
    Re: EGR Intake Manifold on 71 or 72 Corvettes

    Bruce, No Egr 's On 71/72
    New England chapter member, 63 Convert. 327/340- Chapter/Regional/national Top Flight, 72 coupe- chapter and regional Top Flight.

    Comment

    • Michael W.
      Expired
      • April 1, 1997
      • 4290

      #3
      Re: EGR Intake Manifold on 71 or 72 Corvettes

      I believe the EGR valves first appeared on the '73 MY cars, not before.

      Comment

      • Tom P.
        Extremely Frequent Poster
        • April 1, 1980
        • 1814

        #4
        Re: EGR Intake Manifold on 71 or 72 Corvettes

        Originally posted by Michael Ward (29001)
        I believe the EGR valves first appeared on the '73 MY cars, not before.
        Correct, across the engine line, the first year for EGR was 1973.

        Comment

        • Bruce N.
          Expired
          • March 23, 2008
          • 83

          #5
          Re: EGR Intake Manifold on 71 or 72 Corvettes

          Thanks guys. I hoped that some of the late run 72's may have had some EGR parts. Thanks again.

          Comment

          • Edward J.
            Extremely Frequent Poster
            • September 15, 2008
            • 6940

            #6
            Re: EGR Intake Manifold on 71 or 72 Corvettes

            Bruce, Do you have a 72 with a EGR on it ?
            New England chapter member, 63 Convert. 327/340- Chapter/Regional/national Top Flight, 72 coupe- chapter and regional Top Flight.

            Comment

            • Don W.
              Expired
              • September 30, 1997
              • 492

              #7
              Re: EGR Intake Manifold on 71 or 72 Corvettes

              It may be correct. I have a Nov '69 build 427 coupe with 70 454 heads dated Oct '69...Don

              Comment

              • Patrick H.
                Beyond Control Poster
                • December 1, 1989
                • 11608

                #8
                Re: EGR Intake Manifold on 71 or 72 Corvettes

                Originally posted by Bruce Noland (48784)
                Thanks guys. I hoped that some of the late run 72's may have had some EGR parts. Thanks again.
                Nope.

                I've seen some of the latest; no EGR.
                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

                • Bruce N.
                  Expired
                  • March 23, 2008
                  • 83

                  #9
                  Re: EGR Intake Manifold on 71 or 72 Corvettes

                  Edward,
                  My Corvette does not have the EGR intake. I was hoping that some were produced because I race this car and found out the EGR intake produces more horsepower than the non EGR intake. Our classes are limited to orginal parts so that's it. Thanks again.

                  Comment

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

                    #10
                    Re: EGR Intake Manifold on 71 or 72 Corvettes

                    Originally posted by Bruce Noland (48784)
                    Edward,
                    My Corvette does not have the EGR intake. I was hoping that some were produced because I race this car and found out the EGR intake produces more horsepower than the non EGR intake. Our classes are limited to orginal parts so that's it. Thanks again.
                    Bruce------


                    Do you mean that an EGR manifold with functional EGR makes more horsepower than a non-EGR manifold or do you mean an EGR manifold with non-functional (i.e. with block-off plate) EGR makes more power than a non-EGR manifold? I've never heard of either, but I highly doubt that an engine with functional EGR makes more power than an equivalent engine without EGR.

                    I suppose it's possible that an engine equipped with a non-functional (i.e. with block-off plate) EGR manifold MIGHT make more power than a non-EGR manifold because of some slightly more advantageous configuration of the inlet runners. I've never heard of that and it seems doubtful to me, but I suppose it's possible.

                    As far as I know, a functional EGR system is one of the more "performance limiting" systems on an engine.

                    Also, as others have mentioned, I seriously doubt that any 1972 Corvette would have been built with an EGR system, functional or not. For this to have occurred a 1972 small block would have had to be equipped with a GM casting #3997771 manifold or big block equipped with a GM #353015 and I don't think that any were.
                    In Appreciation of John Hinckley

                    Comment

                    • Bruce N.
                      Expired
                      • March 23, 2008
                      • 83

                      #11
                      Re: EGR Intake Manifold on 71 or 72 Corvettes

                      Hi Joe,
                      The class guides do not require a functioning EGR system. We pull the EGR and fill the exterior holes.

                      I raced the same motor in my Camaro for years. The 71 (469) and 72 (751) intakes make 14 horsepower less on the dyno than the 73 (771 or 261) intakes on the same motor.

                      The 73 intakes have a slightly larger "bowl" area under the carburetor and make use of a 15/16" hole between the planes. Both of these attributes aid in mixing and distributing the air/fuel mixture.

                      Over the years, I have noticed many quirky year end numbers and systems floating around. So I thought it may be possible for a few of the Corvettes to have the EGR systems. Just a few of them would have done the trick.
                      Thanks.

                      Comment

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