1969-72 2" Exhaust - NCRS Discussion Boards

1969-72 2" Exhaust

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  • Joe L.
    Beyond Control Poster
    • January 31, 1988
    • 43198

    1969-72 2" Exhaust

    About 7 or 8 months ago there was a thread here on the discussion board which got into the configuration of the 1969-72 Corvette 2" rear exhaust pipes. I mentioned that my recollection was that my original 2" rear pipes were "flattened". Others disagreed. By the time the discussion was over with, I was seriously doubting my recollection that the rear pipes were flattened.

    At the recent 2009 NCRS National Convention I had a chance to carefully inspect a Bow-Tie candidate, 1969 L-88 while it was up on one of the lifts (much to the disconcert, I might add, of a few of the "judging staff"). I am 99% certain that the exhaust system on this car is original to the car

    In any event, my faith in my recollection of the configuration of the 2" rear pipes has been re-established. The rear pipes of this car were obviously flattened in certain areas. In the area beneath the spring, the pipes are significantly flattened. This is shown in the photos below. In other areas, the pipes are more subtly flattened. Unfortunately, it is subtle enough that it did not show up at all well in the photos, so I'm not including them. (I would have been able to show it if I could have cut the pipes and photographed the cross section but I don't think the owner would have approved and I didn't have the tools with me anyway).

    By the way, some folks are under the impression that 1969 L-88's, if not other 1969 big blocks, were equipped with 2-1/2" exhaust. As I have mentioned many times before, ALL 1969 Corvettes were equipped with 2" exhaust. This car pretty much proves that point, too, as far as L-88's are concerned. All big blocks of ALL other years (i.e. 65-68 and 70-74) were equipped with 2-1/2" exhaust, but 1969 was not.
    Attached Files
    In Appreciation of John Hinckley
  • Bryan M.
    Expired
    • March 31, 1999
    • 386

    #2
    Re: 1969-72 2" Exhaust

    Joe,
    I'm not sure of the originality of the system but, check out the exhaust on this supposedly 38,000 mile 68. You can see some flat spots in the system.







    Comment

    • Duke W.
      Beyond Control Poster
      • December 31, 1992
      • 15631

      #3
      Re: 1969-72 2" Exhaust

      I don't recall that thread, but I do recall reading a long time ago that the '68-up pipes had to be "flattened" more than on C2s due to the redesign of the rear strut rod bracket to lower the roll center of the '68-up rear suspension.

      Duke

      Comment

      • Joe L.
        Beyond Control Poster
        • January 31, 1988
        • 43198

        #4
        Re: 1969-72 2" Exhaust

        Originally posted by Bryan Montford (32138)

        Brian-----


        Yes, I would not question that these are the original rear pipes (but not the mufflers since these mufflers are clamp-retained). However, I don't think there was ever any question that the 2-1/2" pipes were flattened. All 1968 Corvettes used 2-1/2" pipes----from base 300/327 to L-88.
        In Appreciation of John Hinckley

        Comment

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