69 Dart/Barracuda 340/383 tail pipe question. Are Part numbers 2925671 and 2926670
2 inches or 2 1/4 inches?
2 inches or 2 1/4 inches?
69 Dart/Barracuda 340/383 tail pipe size?
- Thread starter ls23h
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HemiSSDart
Dartus Interuptus
Don't know the part number of the top of my head but the tail pipes are 1-3/4"...
What I meant is that the factory chrome tips were 1-3/4", so the pipes must have been 1-7/8" as the tips fit inside the tail pipes...
What I meant is that the factory chrome tips were 1-3/4", so the pipes must have been 1-7/8" as the tips fit inside the tail pipes...
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Been through this on my '68 cuda 383. Different venders supplied slightly different variations from the factory. So there will be some debate about what was "original". Originally my car came with 1 7/8"/ 2" exhaust w/ tips. The system was 2" through the mufflers and over the rear end. Then the pipe was reduced to 1 7/8" out to the 1 7/8" tips.Accurate Exhaust was very helpful as they have collected NOS pipes from these cars and reproduce them. Along with exact reproductions they also offer variations of the system. For me, I decided on 1- piece headpipes and 2 1/4" system out to the tips. This makes it the same as a "B" body exhaust system. The system fit very well and the car has a very healthy sound, and looks original.
VOETOM
Well-Known Member
VOETOM
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Hope these add to what the previous posters have explained. Front section is 2.25" OD and the 1.875" OD tips fit inside the tailpipes' outlet.
HemiSSDart
Dartus Interuptus
With my NOS tail pipes I had to use two reducers to fit the mufflers supplied by Accurate. I have no idea what muffler they sent me but I told them I had NOS tail pipes and at that time they had no idea what size the factory used. This was in 1992...
the Accurate Liimited tailpipes are 2 1/4 unless you ask for something else.
IMHO if you want something smaller it would be more straight forward to just stuff a rag up the tailpipe
IMHO if you want something smaller it would be more straight forward to just stuff a rag up the tailpipe
HemiSSDart
Dartus Interuptus
Not all of us are into this for hot rodding, stock works just fine. I have plenty of other Darts for hot rodding. I don't know how anyone owns just one A-body...
Thanks for all the replies! I’ve been in contact with Gardner exhaust
gardnerexhaust.com with their efforts to produce systems for Big Block A bodies. They are close to completing 67/68 system, but they’re missing the 69 rear pipe to duplicate. I’m hoping to put one of the first 69 systems on my car soon.
gardnerexhaust.com with their efforts to produce systems for Big Block A bodies. They are close to completing 67/68 system, but they’re missing the 69 rear pipe to duplicate. I’m hoping to put one of the first 69 systems on my car soon.
Dons exhaust they copy it from NOS Pipes
HemiSSDart
Dartus Interuptus
Well I took a close look at my NOS pipes today, they are 1-7/8" OD and 1-3/4" ID. They do not have slots where the tips go in, so I don't know what the pipes are above. I bought these pipes in the late 80's and they had the part number on them that matched the 1969 Mopar parts catalog. The last pic is the reducer I had to use to make them work with the mufflers Accurate sent me. There has never been exhaust through these pipes, they were on my 69 383 GTS that burned in my garage, that is why they look bad. The tips and pipe hangars are NOS also...
so if the end of those pipes are 1 3/4 ID where they are swelled for the tips, I can only guess how small the actual tailpipe before the swell is - 1 5/8 or less???
HemiSSDart
Dartus Interuptus
The tips are 1-3/4 ID so the swell must be 2", I didn't measure that but I will when I get back to the shop in a couple of days...
autoxcuda
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NOS can differ from Factory Assembly-Line Installed.
For a reproduction part, good assembly line take offs should also be examined.
Tom said his tailpipe was "stock" off his 69 340 (Barracuda). So I'm taking that as an original assembly-line part, taken off.
autoxcuda
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Please @VOETOM check over this... But here is my thinking.
When air temperature lowers it takes up less space. PV=nRT
Seems like EGT's near manifolds 1000 deg F. And tailpipes at 500 deg F.
So.... 34% drop in volume in ideal situation. But shouldn't be way far off from reality.
If volume goes down, you don't need as big of tailpipe as head pipe. At least that's what I'm thinking.
***I'm not sure if the psi I'm assuming is right. But the 34% ratio is the same IF the pressure is the same front to back. ***
I still have the original exhaust on my Barracuda. I can take some pictures if you like
HemiSSDart
Dartus Interuptus
The part number tags on my NOS pipes were 2925670 and 2925671. I took pictures of them before I put them on the car, but I cannot find them now as it was in the late 90's and were taken with my Sony Mavica...LOL
In 77 or 78 I bought new tail pipes for my 70 340 swinger. They were 1 3/4. I had headers and went back to full factory exhaust. The front pipes were 2 1/4 on the pass side. The front half of the drivers side was 2 inch to go around the starter and between the T bar then stepped up to 2 1/4 inch to the muffler. Kim
340sFastback
Well-Known Member
Most likely Chrysler went with the undersized tail pipes so when they slapped the cars together on the assembly line less chance of pipes hitting gas tank or frame ect. Thats my guess.
And like someone said above exhaust gasses cool as they travel rear ward and require less pipe size to flow the further away from the engine they go.
And like someone said above exhaust gasses cool as they travel rear ward and require less pipe size to flow the further away from the engine they go.
VOETOM
Well-Known Member
I forgot to also add you can tell they are factory pipes because of the hole in the low spot right before the reduction for the chrome tips. 340 Darts and Cudas in 69 had six water draining holes: two in mufflers, two in tailpipes, and two in the chrome tips.
VOETOM
Well-Known Member
These factory front 340 pipes are what Kim is describing.
View attachment 1715969989
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That’s right VOETOM. I had some posted for sale this winter. The 2 flanged pipes are from a 70 duster. Other bell pipe is 1971. Notice how the bottom of both pipes are flattened some. Kim
ir3333
Well-Known Member
That was my understanding...stock 340 were 2 1/4 to the mufflers with 1 7/8 tail pipes. Cooling exhaust gases required narrower tail pipes to keep velocity up. Now i am looking for a new system and don't know diameter i am going with for my 340?
HemiSSDart
Dartus Interuptus
I found NOS 69 tail pipes at the Michigan swap in January and gave them to Gardner Exhaust to reproduce a couple months ago to go with the NOS 383 headpipes I gave them a couple years ago. They sent me the first set of the headpipes to bolt on my car and they were excellent! Can't wait to see the mufflers and tail pipes!
VOETOM
Well-Known Member
Stock 340s were 2.25" then about 2 to 2/18" then about 2" OD and the tips pushed inside of them. They are bit larger than 1.70" or so I think. I have original ones you can see. Waldrens made me set a while back to use. Tom Hand
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