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I am attempting to build my own exhaust piping on my 51 PU. I am using a cast iron manifold which was stock on older mustangs. So I'm not sure what the correct connection is to the flange. It looks like there is a machined inverted flare on the inside. two bolt flange. outside of the flare looks about 2.4" diameter and the inside about 2.0". Is it connected to a pipe that is like a ball and socket some how or is there a special gasket that sits in there. I hope you guys can help me out here.
Last edited by geoffthepilot; Aug 4, 2016 at 04:22 PM.
Reason: adding picture
If I remember correctly the pipe had the same flare on it, backed up by a metal flange that squished the two together when the two bolts were tightend. Between the two was the donut, It was made of an asbestos type material, heck it could have been asbestos back then, that acted like a big heat resistant o-ring to seal the two flanges.
The pipe has the same flare as the manifold and, if done correctly, should have a piece of straight pipe pressed inside to keep the donut gasket centered and reduces exposure to hot exhaust gases. Donuts are available at any parts store or muffler shop.
That sounds easy enough. do you think one of the ball and socket pipes would work on there. and just use half of it or do you think it needs to be a specific flare angle. or if anyone had a picture of such a thing it would make it that much easier to put together.
Ball and socket = no. Simple flare, any muffler shop that can bend pipe should be able to make the flare in less than 30 seconds. I spent six years with Midas, many moons ago. I can appreciate trying to make your own but I wouldn't do it unless I had some bizarre plan. I guess after doing so many it's difficult to imagine spending so much time and effort doing it any other way. Good luck on ya!
BTW, you'll want fiber donuts, not the metal type shown above.
Ball and socket = no. Simple flare, any muffler shop that can bend pipe should be able to make the flare in less than 30 seconds. I spent six years with Midas, many moons ago. I can appreciate trying to make your own but I wouldn't do it unless I had some bizarre plan. I guess after doing so many it's difficult to imagine spending so much time and effort doing it any other way. Good luck on ya!
BTW, you'll want fiber donuts, not the metal type shown above.
On the stock manifolds I have it looks as those donuts are part of the manifold and now that you said there are metal ones I'm wondering if they could be seized in the manifolds or did they make the manifolds that way. The manifolds are from an 1983 351w
Can I ask why you're using cast iron ma idols instead of headers? Looks like you have a pretty modern upgrades to the engine. Fuel injection, electric distributor pulley system. Plus making your own exhaust. So why the cast iron manifold?
Not to answer for him but for me I watched a video where they beat the snot out of a pair of headers to prove that restrictions made on headers to clear for steering linkage made no difference so figure why spend $400-$800 on headers when stock manifolds do just as good of a job..
I can't remember where I seen it posted, think it was on here that someone posted it but it convinced me that headers were more for looks other than function.. it was a youtube clip though so might find it on there..
Thank you guys for all the help. I went with the manifolds for a few reasons. lots of more room for the steering and all, they don't let as much heat out into the engine bay and I'm not so much looking for a bunch of power. trying to make a nice driver. also I would agree that the engine and all does look pretty dressed up with a lot of fancy do dads and such. that's not what I first set out to do. I'm out on the island of Kauai in Hawaii and there are not places to go to get old parts or places that will touch old stuff like these. No junk yards, So a lot of this stuf is ordered on line new stuff. The efi is to make it a fuel savy daily driver. I'm not super opposed to getting the work done for me at a shop but the best quote I have got so far was 1200 to make it. How much would that run you guys over there on the mainland? also @56Pannelford, I have an old set of manifolds for a 429 and they have the reverse flare cast into them. more of an outy than an inny.
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