Hello, my 1st time & question - NCRS Discussion Boards

Hello, my 1st time & question

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  • Domenic T.
    Expired
    • January 29, 2010
    • 2452

    Hello, my 1st time & question

    I am doing a frame up on my 67 coupe and I noticed the left side of my 427 is visibaly higher than the right. All the frame mounting points are within 3/16'' and the frame was straightened in 1971( body on) when I bought it with left frame horn damage from an accident. A fter removing the body I tweeked the left frame horn down about 1/2 '' to get right on as it measured high and was shimmed about the same. When viewing from front to back all cross members are level with each other.The left mount and cross member looked undamaged. I am going back to the manual and see if there are mount measurements that were over looked but never had to twist a frame there before.
    What do you experts say?
    Thanks,

    Domenic
  • Scott S.
    Extremely Frequent Poster
    • September 11, 2009
    • 1961

    #2
    Re: Hello, my 1st time & question

    Originally posted by Domenic Tallarita (51287)
    I am doing a frame up on my 67 coupe and I noticed the left side of my 427 is visibaly higher than the right. All the frame mounting points are within 3/16'' and the frame was straightened in 1971( body on) when I bought it with left frame horn damage from an accident. A fter removing the body I tweeked the left frame horn down about 1/2 '' to get right on as it measured high and was shimmed about the same. When viewing from front to back all cross members are level with each other.The left mount and cross member looked undamaged. I am going back to the manual and see if there are mount measurements that were over looked but never had to twist a frame there before.
    What do you experts say?
    Thanks,

    Domenic
    Hi Domenic,

    I am not an expert, but I had a similar problem on the '67 I'm restoring, the frame horn was bent a little out of alignment. We put it on a frame-jig and had it straightened out to GM spec. There is a FRAME section with all the frame dimensions in the 1967 Chevrolet Chassis Service Manual, Section 2. I tried to attach a pdf copy of the Frame Spec sheet, but it's a 1.3MB file and the forum only allows up to 293kb.

    Here is a JPEG screen capture. If you don't have a '67 Chassis Service Manual and this picture isn't clear enough, send me a PM with your email and I will send you the pdf attachment that way.
    Attached Files

    Comment

    • Domenic T.
      Expired
      • January 29, 2010
      • 2452

      #3
      Re: Hello, my 1st time & question

      Originally posted by Scott Smith (50839)
      Hi Domenic,

      I am not an expert, but I had a similar problem on the '67 I'm restoring, the frame horn was bent a little out of alignment. We put it on a frame-jig and had it straightened out to GM spec. There is a FRAME section with all the frame dimensions in the 1967 Chevrolet Chassis Service Manual, Section 2. I tried to attach a pdf copy of the Frame Spec sheet, but it's a 1.3MB file and the forum only allows up to 293kb.

      Here is a JPEG screen capture. If you don't have a '67 Chassis Service Manual and this picture isn't clear enough, send me a PM with your email and I will send you the pdf attachment that way.
      Thanks Scott,
      I did measure all stations when I tweeked it ( heated and bent horn down) to meet the spec. My shop floor seems to be level enough to get good measurements. It's the engine high on left side that I am wondering about. The first thing that I noticed is that the engines are intencially out of center (to the right) and I thought someone might say " yep, that's how they came" or some one screwed up at the factory. I straightened a few frames and learned to look for imperfections in the metal from previous repairs or accidents.
      I couldn't figure out how to get your page of the frame out but I am going back to the shop today and will pull the books out and see if there are spec's on the hight of the mounts. I was going to do that yesterday and the shop was 115 with the big doors open so my son handed me a beer and I helped him work on the steem cleaner that was in front of the cooler fan.
      Thanks again

      DOM

      Comment

      • William C.
        NCRS Past President
        • May 31, 1975
        • 6037

        #4
        Re: Hello, my 1st time & question

        The engine is offset to the right to make up for the weigh of the driver on the left (or at least that is what I've been told) The frame diagram shows equal distance to the mounting hole centerline for each side engine mount from a "frame level" baseline.
        Bill Clupper #618

        Comment

        • Donald O.
          Extremely Frequent Poster
          • May 31, 1990
          • 1580

          #5
          Re: Hello, my 1st time & question

          I had always thought that the offset s=was for the ring and pinion offset in t he rear.
          BWTFDIK

          DonO
          The light at the end of the tunnel has been turned off.

          Comment

          • Terry M.
            Beyond Control Poster
            • September 30, 1980
            • 15573

            #6
            Re: Hello, my 1st time & question

            And I thought the offset was for more room for the pedals on the driver's side -- no unintended acceleration here.
            Terry

            Comment

            • Jack H.
              Extremely Frequent Poster
              • April 1, 1990
              • 9906

              #7
              Re: Hello, my 1st time & question

              I believe the first answer (compensate for weight of driver to 'try' to get the car weight neutral in both the fore/aft and side-to-side axis) is the correct explanation. This is different from the design practices of ordinary passenger cars.

              It's also one of the 'headache' issues faced by the down under gang when they go to execute a LH -> RH conversion. Some conversion shops actually modify the front cross member and transmission tunnel to re-orient the factory original power train offset!

              Comment

              • Ray G.
                Extremely Frequent Poster
                • May 31, 1986
                • 1187

                #8
                Re: Hello, my 1st time & question

                Originally posted by Jack Humphrey (17100)
                I believe the first answer (compensate for weight of driver to 'try' to get the car weight neutral in both the fore/aft and side-to-side axis) is the correct explanation. This is different from the design practices of ordinary passenger cars.

                It's also one of the 'headache' issues faced by the down under gang when they go to execute a LH -> RH conversion. Some conversion shops actually modify the front cross member and transmission tunnel to re-orient the factory original power train offset!
                Hello Jack;
                Interesting observations.
                Guess that would really give them a disadvantage on a "go fast turn left" racetrack.
                Correct Trim height certainly makes a Corvette look intimidating.
                Ray
                And when you get the choice to sit it out or dance
                I hope you dance


                Comment

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