I'm redoing my due to a doubler. Headers into a y pipe into a single exhaust out the side. V band at the muffler to help with installation and removal. Do I need a flex joint somewhere in the exhaust?? The old duals didn't have one anywhere.
CK5
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Flex joint in exhaust?
- Thread starter 85 Jimmy
- Start date
I put some in mine as did @6872xtc
We found there’s enough flex in the frames to unseat the collectors and create leaks above the O2 sensor, making the fuel injection unhappy
His system is similar to what you have
I now have 3 flex sections in mine, but I also have very short headers. The factory manifolds had the ball and socket connectors to deal with the movement. And yes, these frames flex a good amount.
My leak was so small that it was not heard by several people except one. I had to have a stethoscope to hear it, but I definitely messed up the air hitting the O2 sensor.
My leak was so small that it was not heard by several people except one. I had to have a stethoscope to hear it, but I definitely messed up the air hitting the O2 sensor.
How short can you get these things?
I'm torn between a flex section, and trying the GM manifold method, using exhaust springs on the header flange bolts.
Seems it could be hard to fit in a flex section and keep the converter in the stock location when running a y-pipe off the headers.
I'm torn between a flex section, and trying the GM manifold method, using exhaust springs on the header flange bolts.
Seems it could be hard to fit in a flex section and keep the converter in the stock location when running a y-pipe off the headers.
Believe the ones @6872xtc used are 6"
I believe that the length varies depending upon the size of the pipe. But some do have shorter ends, as well as center sections. The ones that I got for the 2.25" pipe are only 4" overall. The one that I put in the 3" section was 6"and had better tube pieces to weld to.
I feel that the port size of the cylinder heads can dictate which option to use. Stock manifolds may be the most durable, but probably not fail safe either.
The only way I see springs under the bolts working on headers, is a ball and socket flange. Otherwise I think that you will not be able to keep gaskets sealed up.
I feel that the port size of the cylinder heads can dictate which option to use. Stock manifolds may be the most durable, but probably not fail safe either.
The only way I see springs under the bolts working on headers, is a ball and socket flange. Otherwise I think that you will not be able to keep gaskets sealed up.
A picture of the small ones, and my not great welds.
I gave up trying to run beads on exhaust I just overlap tacks.
I went extreme and tied the cage to the frame in 22 places to stiffen the frame so I did not need the flex joint in the exhaust.
That, and that poor, tired TBI 350 probably doesn't move around too much from torque...I went extreme and tied the cage to the frame in 22 places to stiffen the frame so I did not need the flex joint in the exhaust.
#gotstockmanifolds?
It's not tired. It never had any ponies to begin with. Every time I float the valves, it makes them softer so they can move faster.
#racetrucktolerances
#racetrucktolerances
