RPO687 duct orientation - NCRS Discussion Boards

RPO687 duct orientation

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  • Mike E.
    Extremely Frequent Poster
    • February 28, 1975
    • 5134

    RPO687 duct orientation

    Regarding the fiberglass ducts that mount in the lower outboard radiator surround area and funnel air to the front brake scoops: is the flange mounted to the front side of the radiator surround area fiberglass, or to the aft side of the glass. Just noticed that the AIM indicates the front, but in person, I've generally seen to the rear. Mounting with the flange to the front makes them appear considerably shorter and the air would be somewhat less direct to the scoop. Have you seen an unmolested original, and if so, what have you seen? Both of my RPO cars had them mounted to the aft, but neither was unmolested.
  • David G.
    Very Frequent User
    • May 31, 1980
    • 274

    #2
    Re: RPO687 duct orientation

    Mike, I believe that the ducts were mounted from the rear. When I restored
    my 62, I tried to install them from the front and they would not fit. When I tried to
    mount them from the rear all of the holes lined up correctly. The ducts were not
    installed on the car when I purchased it.
    Dave Gray
    Carlisle, Pa.

    Comment

    • Dave S.
      Extremely Frequent Poster
      • August 31, 1992
      • 2918

      #3
      Re: RPO687 duct orientation

      Mike,
      As with David's car mine did not have the ducts but the square hole and screw holes were there. The only way the duct would fit was from the rear. Any other #687 car that I have seen has them that way as well.

      Comment

      • Mike M.
        NCRS Past President
        • May 31, 1974
        • 8365

        #4
        Re: RPO687 duct orientation

        they were mounted on the rear of my 61 rpo vet BEFORE i disassembled them from their virgin body. like the others have responded , i don't think its possible to mount them on the front side without modifications,mike

        Comment

        • Mike E.
          Extremely Frequent Poster
          • February 28, 1975
          • 5134

          #5
          Re: RPO687 duct orientation

          That's what I've always thought. Had the question because the AIM indicates otherwise, and because I recently saw a silver/red car for sale, supposedly original 687 car, with them mounted from the front. Didn't look right, seem right, feel right, but seller was adamant about its correctness. Probably too adamant--that should have confirmed my concerns! Thanks

          Comment

          • James G.
            Extremely Frequent Poster
            • May 31, 1976
            • 1556

            #6
            Re: RPO687 duct orientation

            Originally posted by Mike Ernst (211)
            Regarding the fiberglass ducts that mount in the lower outboard radiator surround area and funnel air to the front brake scoops: is the flange mounted to the front side of the radiator surround area fiberglass, or to the aft side of the glass. Just noticed that the AIM indicates the front, but in person, I've generally seen to the rear. Mounting with the flange to the front makes them appear considerably shorter and the air would be somewhat less direct to the scoop. Have you seen an unmolested original, and if so, what have you seen? Both of my RPO cars had them mounted to the aft, but neither was unmolested.
            I THINK THIS MIGHT HELP


            Over 80 Corvettes of fun ! Love Rochester Fuel Injection 57-65 cars. Love CORVETTE RACE CARS
            Co-Founder REGISTRY OF CORVETTE RACE CARS.COM

            Comment

            • Mike E.
              Extremely Frequent Poster
              • February 28, 1975
              • 5134

              #7
              Re: RPO687 duct orientation

              Jim,
              that would help more if I knew something about the history of the car, namely, is it un modified? I know how attach them from that side. Seems to me that the AIM indicates install from the other side, and I recently saw a for sale car that had them done from the front as well.
              thanks,
              Mike

              Comment

              • Al R.
                Very Frequent User
                • June 30, 1988
                • 687

                #8
                Re: RPO687 duct orientation

                Mike, both my 59 & 60 cars had them installed on the back side as well. Not sure if either were untouched, but the 59 is a 4 owner (me) and appears untouched. Al

                Comment

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