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'71 351C fitting/routing of exhaust outlet pipe over rear axle
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ManniB



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    Post: #1
    '71 351C fitting/routing of exhaust outlet pipe over rear axle

    Hi,

    I have ordered an original style exhaust system for my '71 351C 4V Mach 1. Everything fits nicely except (why is there always an except???) the outlet pipe on the driver side. The problem is, the pipe somehow collides with the brake hose that connects to the rear axle.

    Before I start modifying thinks I would like to ask if anyone has pictures that show how the pipe fits over the rear axle. Is it possible that the staggered shock setup contributes to the problem?

    Thank you for any help, Manfred
    Offline 07-26-2010 07:17 PM
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    cobra3073


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      Post: #2
      RE: '71 351C fitting/routing of exhaust outlet pipe over rear axle

      Bumping this back to the top.

      I do not personally have any pictures of how the "stock" exhaust is supposed to look as I am running headers on both of my '73s.

      I would think the staggered shocks should not be an impediment if you are using a stock system that was designed for it, but stranger things have happened.

      Hopefully, someone will be able to submit some pictures for you.

      I, of course, am a modifier, so if all else fails, modify!

      BT
      Offline 07-28-2010 06:27 PM
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      72 R Code



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        Post: #3
        RE: '71 351C fitting/routing of exhaust outlet pipe over rear axle

        Here are a few pictures. I hope it helps. Excuse the nasty underside. it is an original car, but the exhaust has been changed many years ago. It is still the original configuration. The staggered shocks should only help as the shock is behind the axle on this side. It is close though. About an inch clearance at the closest spot. Good luck!


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        Offline 07-29-2010 01:21 PM
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        ManniB



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          Post: #4
          RE: '71 351C fitting/routing of exhaust outlet pipe over rear axle

          Great pictures, thanks. It is quite a close fit as they show. And no need to excuse that a 40 year old car doesn't look like as it came from the factory.

          Regards, Manfred
          Offline 07-29-2010 05:04 PM
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          72HCODE


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            Post: #5
            RE: '71 351C fitting/routing of exhaust outlet pipe over rear axle

            Ok I had the same issues with the same kit, I even went through 2 complete exhaust kits the second was worse then the first.

            I can take pictures but First I used a pipe expander, using that with an impact wrench, I opened up the end of the turbo mufflers in the kit I used. This allowed me to slide the pipes further back away from the axle as it's a tight bend.

            After doing that I discovered I could clear the brake line but came close to shock and fuel line and fuel sender wiring, plus I discovered I was way too low at the rear valance.

            Frustrated I begin shifting things around for days. What finally helped seat things was rotating my mufflers from horizontal to 20 degrees diagonal. Sort of like \ / this angle allowed the mufflers to sit wider on the intermediary pipes and the angle of the outlets in the mufflers was enough to get the tail pipes to sit correctly between the brake line, shock, fuel line, and wiring and rear valance.

            Additionally the turn downs in the tail pipes for the Mach 1 chrome extensions do not fit, the turn downs on the pipes are totally wrong, and the reproduction tail pipe chrome tips are totally wrong also.

            I used a dermal and I cut the tail pipe tips down so they stuck out from the valance correctly, and had to turn one strap around on the tips to prevent a fuel tank puncture in case of a rear collision.


            I fought the thing forever when I was done I ended up having slight exhaust leaks, I had to go back and braze some of the joints, as a kit it sucked. If I have to do it again I would have a custom system made with resonators in the tail pipes.

            I will take pics
            Offline 08-03-2010 05:25 PM
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            machman_73



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              Post: #6
              RE: '71 351C fitting/routing of exhaust outlet pipe over rear axle

              Angry
              (08-03-2010 05:25 PM)72HCODE Wrote:  Ok I had the same issues with the same kit, I even went through 2 complete exhaust kits the second was worse then the first.

              I can take pictures but First I used a pipe expander, using that with an impact wrench, I opened up the end of the turbo mufflers in the kit I used. This allowed me to slide the pipes further back away from the axle as it's a tight bend.

              After doing that I discovered I could clear the brake line but came close to shock and fuel line and fuel sender wiring, plus I discovered I was way too low at the rear valance.

              Frustrated I begin shifting things around for days. What finally helped seat things was rotating my mufflers from horizontal to 20 degrees diagonal. Sort of like \ / this angle allowed the mufflers to sit wider on the intermediary pipes and the angle of the outlets in the mufflers was enough to get the tail pipes to sit correctly between the brake line, shock, fuel line, and wiring and rear valance.

              Additionally the turn downs in the tail pipes for the Mach 1 chrome extensions do not fit, the turn downs on the pipes are totally wrong, and the reproduction tail pipe chrome tips are totally wrong also.

              I used a dermal and I cut the tail pipe tips down so they stuck out from the valance correctly, and had to turn one strap around on the tips to prevent a fuel tank puncture in case of a rear collision.


              I fought the thing forever when I was done I ended up having slight exhaust leaks, I had to go back and braze some of the joints, as a kit it sucked. If I have to do it again I would have a custom system made with resonators in the tail pipes.

              I will take pics
              I feel your pain Hcode. Machman
              Offline 08-03-2010 05:52 PM
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                Post: #7
                RE: '71 351C fitting/routing of exhaust outlet pipe over rear axle

                Where did you guys buy your various kits. I have been looking at all of the various catalogs, and I wondered about this very problem, and have not yet ordered from anybody. Has anybody tried the Boss 351 kit offered by anybody? Here's my 71 Boss in progress:
                [Image: boss1-1.jpg]
                09-12-2010 10:53 PM
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                72fastback



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                  Post: #8
                  RE: '71 351C fitting/routing of exhaust outlet pipe over rear axle

                  Personally since I bought 3 inch headers I just reduced to 2.5 for the rest of the exhaust and bought tail pipes from flowmaster. Had the bends done at a muffler shop for the alignment from headers to mufflers.Well actually. I brought the car over to the muffler shop and had them put the exhaust together.I had all the parts so all he had to do was bend the pipes and he welded it all.He charged me 220$ for the work.But he did tell me the tail pipes needed to be worked on a little.I figured for the price he was asking it would save me a lot of trouble.From all the people I have talked to there is no kit that fits without some tampering. The bends are never perfect.And by the way he did an amazing job when you look under the car everything is straight and matches up.
                  Offline 09-13-2010 03:57 PM
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                    Post: #9
                    RE: '71 351C fitting/routing of exhaust outlet pipe over rear axle

                    I went ahead and ordered the Boss 351 Kit from C.J. Pony Parts, including the H-pipe and hanger kit. They said the fit is guaranteed. They also said that Motive makes the kits for the specific applications and usually the fitment is not an issue.

                    We shall see. I'll report back after I receive the system. I sure hope it does fit without a lot of issues. -Andy
                    09-20-2010 10:24 PM
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                    71BossPrototype



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                      Post: #10
                      RE: '71 351C fitting/routing of exhaust outlet pipe over rear axle

                      (Just re-posting, since my previous post was listed as "unregistered")

                      (09-12-2010 10:53 PM)71BossPrototype Wrote:  Where did you guys buy your various kits. I have been looking at all of the various catalogs, and I wondered about this very problem, and have not yet ordered from anybody. Has anybody tried the Boss 351 kit offered by anybody? Here's my 71 Boss in progress:
                      [Image: boss1-1.jpg]

                      (Just re-posting, since my previous post was listed as "unregistered")

                      (09-20-2010 10:24 PM)71BossPrototype Wrote:  I went ahead and ordered the Boss 351 Kit from C.J. Pony Parts, including the H-pipe and hanger kit. They said the fit is guaranteed. They also said that Motive makes the kits for the specific applications and usually the fitment is not an issue.

                      We shall see. I'll report back after I receive the system. I sure hope it does fit without a lot of issues. -Andy
                      (This post was last modified: 10-12-2010 09:55 AM by 71BossPrototype.)
                      Offline 10-12-2010 09:54 AM
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