Info Needed Re 1970-74 Big Block - NCRS Discussion Boards

Info Needed Re 1970-74 Big Block

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  • Joe L.
    Beyond Control Poster
    • February 1, 1988
    • 43211

    Info Needed Re 1970-74 Big Block

    If anyone out there has a 1970-74 big block with stock-type exhuast manifolds, I am interested in the clearance that exists between the LEFT (i.e. driver) SIDE FORWARD exhaust pipe and the footwells. Photos would be excellent, too.
    In Appreciation of John Hinckley
  • Joe L.
    Beyond Control Poster
    • February 1, 1988
    • 43211

    #2
    Re: Info Needed Re 1970-74 Big Block

    Doesn't anyone out there have a 70-74 big block that they could check on this for me?
    In Appreciation of John Hinckley

    Comment

    • Alan S.
      Extremely Frequent Poster
      • July 31, 1989
      • 3415

      #3
      Re: Info Needed Re 1970-74 Big Block

      Joe,
      Member Kevin Goodman has a wonderful 71 BB Bowtie car and a digital camera. Try sending him a E-Mail.
      Regards,
      Alan
      71 Coupe, 350/270, 4 speed
      Mason Dixon Chapter
      Chapter Top Flight October 2011

      Comment

      • Tom L.
        Expired
        • May 7, 2007
        • 438

        #4
        Re: Info Needed Re 1970-74 Big Block

        Comment

        • Tom L.
          Expired
          • May 7, 2007
          • 438

          #5
          Re: Info Needed Re 1970-74 Big Block

          Comment

          • Tom L.
            Expired
            • May 7, 2007
            • 438

            #6
            Re: Info Needed Re 1970-74 Big Block

            Sorry, the last picture was an accident. This is what I meant to post. I attached them in large format so you can zoom in for better detail. I hope they help.

            Comment

            • Alan S.
              Extremely Frequent Poster
              • July 31, 1989
              • 3415

              #7
              Re: Info Needed Re 1970-74 Big Block

              Hi Tom,
              Is that Kevin's WAR BONNET at the Mason-Dixon Meet? Hope you're having fun!!
              Regards,
              Alan
              71 Coupe, 350/270, 4 speed
              Mason Dixon Chapter
              Chapter Top Flight October 2011

              Comment

              • Joe L.
                Beyond Control Poster
                • February 1, 1988
                • 43211

                #8
                Re: Info Needed Re 1970-74 Big Block

                Originally posted by Tom Lynam (47343)
                Tom------


                Thanks very much for responding. What I'm most interested in, though, is the clearance between the footwell and the forward, driver side exhaust pipe. Using the 70-74 left side manifold, GM #3969869, which should be the same as yours, I have a minimum clearance of about 11/16" at the very forward corner of the footwell. A 1/2" size, 3/8" drive socket just fits between the pipe and the footwell. I am posting some pictures below of the area I'm talking about.
                Attached Files
                In Appreciation of John Hinckley

                Comment

                • Joe L.
                  Beyond Control Poster
                  • February 1, 1988
                  • 43211

                  #9
                  Re: Info Needed Re 1970-74 Big Block

                  Originally posted by Tom Lynam (47343)
                  Sorry, the last picture was an accident. This is what I meant to post. I attached them in large format so you can zoom in for better detail. I hope they help.

                  Tom-----

                  OK, I'm going to try posting another picture via the URL route and see what happens.

                  Note in the photo a 1/2" size, 3/8" drive standard socket just fits between the forward left side pipe and the footwell at the forward end of the footwell. A 3/4" size, 3/8" drive standard socket just fits between the forward left side exhaust pipe and the footwell at the rear of the footwell.

                  I am extremely interested in how the clearance at similar points on yours or any other 70-74 big blocks compares to that shown in this photo.
                  Attached Files
                  In Appreciation of John Hinckley

                  Comment

                  • Tom L.
                    Expired
                    • May 7, 2007
                    • 438

                    #10
                    Re: Info Needed Re 1970-74 Big Block

                    Sorry Joe, that's all I have. The pictures are not of my car. As Alan pointed out, they're of Kevin Goodman's Bowtie 71 that he was kind enough to let me extensively photograph to help me put my '70 back together. I don't have a picture of the precise area you need.

                    Comment

                    • Kenneth T.
                      Very Frequent User
                      • March 23, 2008
                      • 631

                      #11
                      Tom: Info Needed Re 1970-74 Big Block

                      Originally posted by Tom Lynam (47343)
                      Sorry Joe, that's all I have. The pictures are not of my car. As Alan pointed out, they're of Kevin Goodman's Bowtie 71 that he was kind enough to let me extensively photograph to help me put my '70 back together. I don't have a picture of the precise area you need.
                      I have a '71 BB and I noticed the position of your alternator. Mine is 90 degrees counter clockwise with the plug pointing to the left fender. Should my '71 be the same?

                      Thanks, Ken

                      Comment

                      • Raymond W.
                        Expired
                        • September 30, 2003
                        • 248

                        #12
                        Re: Info Needed Re 1970-74 Big Block

                        Joe,

                        I have a '74 LS4, 4 speed with replacement aluminized exhaust system from CC. I'll be out under the car on Saturday, getting it ready for the Northeast Chapter Meet this Sunday. Let me know if still need this information related to the exhaust/footwell clearances.

                        Ray

                        Comment

                        • Joe L.
                          Beyond Control Poster
                          • February 1, 1988
                          • 43211

                          #13
                          Re: Info Needed Re 1970-74 Big Block

                          Originally posted by Raymond Wells (40797)
                          Joe,

                          I have a '74 LS4, 4 speed with replacement aluminized exhaust system from CC. I'll be out under the car on Saturday, getting it ready for the Northeast Chapter Meet this Sunday. Let me know if still need this information related to the exhaust/footwell clearances.

                          Ray
                          Ray-----


                          Yes, that would be great. As a matter of fact, this pipe seen in the photos I posted is actually a CC piece, so it will be a direct comparison. The CC piece is configured exactly like the GM original, so it should also demonstrate what the original clearance was. I'm not 100% sure, though, that the 74 footwells were the same as earlier but that's one of the things I'm trying to find out.
                          In Appreciation of John Hinckley

                          Comment

                          • Raymond W.
                            Expired
                            • September 30, 2003
                            • 248

                            #14
                            Re: Info Needed Re 1970-74 Big Block

                            Joe,

                            In the two photos there are five (5) sockets, the clearance measurements of each socket from front to rear are as follows; 31/32", 1-3/16", 1-1/8", 1-1/16", 7/8". Note: the last socket measurement is up against the exhaust clamp and the first one is up against the front portion of the footwell that protrudes. Between this narrative and the photos, I hope you find it helpful. If you need anything else just let me know.

                            Ray

                            P.S. My first attempt at including photos...hope they come through ok.

                            Comment

                            • Raymond W.
                              Expired
                              • September 30, 2003
                              • 248

                              #15
                              Re: Info Needed Re 1970-74 Big Block

                              Joe,

                              I sent this same message to your email with the photos attached.

                              Ray

                              Comment

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