Moparts
1968 383 Roadrunner Assemblyline Exhaust Questions
Posted By: Mike Mancini
1968 383 Roadrunner Assemblyline Exhaust Questions - 02/19/13 05:19 AM
Hi,
Does anyone have a survivor 383 68RR with original exhaust. Trying to do some research on what true original assemblyline exhaust looks like for this application. Any pics or help is greatly appreciated. Thanks
Mike
Posted By: Anonymous
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/19/13 10:37 PM
I know its not a picture on the car but I heard ECS now makes exact reproduction pieces. Also Accurate Exhaust claims to be correct too.
I know Gardner is expensive but don't know how correct theirs is. Maybe one of those 3 have either pics of originals on the car or off the car for comparison.
Posted By: Mike Mancini
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/19/13 11:12 PM
I am looking for pics of original assembly line exhaust and mufflers removed from or currently installed on a 68 RR.
Posted By: Anonymous
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/19/13 11:18 PM
oh ok. maybe one of them has some pics which would help ya?
Posted By: moparpollack
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/19/13 11:54 PM
How much of the exhaust any certain parts?
Posted By: lewtot184
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/20/13 12:57 AM
i remember on my '68 383 car that the exhaust pipe, 2 1/4" o.d., was welded to the muffler and the muffler was smaller than the 440 cars.
Posted By: Mike Mancini
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/20/13 04:14 AM
Thanks Lewtot... i am looking for pics of the mufflers and headpipes and tailpipes. Any help is appreciated.
Posted By: Anonymous
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/20/13 11:32 AM
Quote:
i remember on my '68 383 car that the exhaust pipe, 2 1/4" o.d., was welded to the muffler and the muffler was smaller than the 440 cars.
Thats weird that Chrysler would make a different muffler for a separate B engine and waste all the money for engineering something different when the over the counter replacement stuff wast he same as the 440's. Even the parts book I have lists the same muffler for the big blocks.
Posted By: lewtot184
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/20/13 02:35 PM
Quote:
Quote:
i remember on my '68 383 car that the exhaust pipe, 2 1/4" o.d., was welded to the muffler and the muffler was smaller than the 440 cars.
Thats weird that Chrysler would make a different muffler for a separate B engine and waste all the money for engineering something different when the over the counter replacement stuff wast he same as the 440's. Even the parts book I have lists the same muffler for the big blocks.
thats what i thought until i went to change them. i did end up using a 440 muffler because it would slip over the pipe and the replacement was a butt weld. remember that 383's had smaller exhaust and tail pipes vs the 440 cars.
Posted By: MO_PA
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/20/13 06:52 PM
Butt weld would never be factory!! Sometimes on those new cars we at the dealer would put a couple of small welds at joints so the pipes would not twist and or come apart. Other times we drilled a small hole and put a small screw through the joint.
As I remember the mufflers were the same length on 383's and 440's.
Posted By: 6bblgt
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/20/13 09:30 PM
In 1970 they made specific 383 mufflers for cars sold in CA.
So, a different factory exhaust/muffler for the introduction of the '68 383 Road Runner vs. 440 GTX (with H-pipe) is easily possible. When introduced, the '68 Road Runner was the only car available with the 383HP 335hp engine.
Pontiac had a mechanically operated "cut-out/straight-thru" muffler available as an OPTION in '70, I'm sure a bunch of engineering went into that for the few that were built. Monies were spent on creating the correct desired "IMAGE".
Posted By: lewtot184
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/20/13 11:08 PM
Quote:
Butt weld would never be factory!! Sometimes on those new cars we at the dealer would put a couple of small welds at joints so the pipes would not twist and or come apart. Other times we drilled a small hole and put a small screw through the joint.
As I remember the mufflers were the same length on 383's and 440's.
really? i bought the car new in april of '68. played around with it for 6yrs. i think i ought to know what it was, 
.
Posted By: lewtot184
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/20/13 11:15 PM
Quote:
In 1970 they made specific 383 mufflers for cars sold in CA.
So, a different factory exhaust/muffler for the introduction of the '68 383 Road Runner vs. 440 GTX (with H-pipe) is easily possible. When introduced, the '68 Road Runner was the only car available with the 383HP 335hp engine.
Pontiac had a mechanically operated "cut-out/straight-thru" muffler available as an OPTION in '70, I'm sure a bunch of engineering went into that for the few that were built. Monies were spent on creating the correct desired "IMAGE".
i still have the original exhaust pipes off my '69 r/t, h-pipe and tails. the exhaust pipes on my road runner were 2 1/4" o.d.. they were swagged out at the manifolds with the 2 1/2" flanges welded to them; no h-pipe. the h-pipe of my r/t is welded one piece 2 1/2" with flattened sections and would not bolt to a 383 do to width. the r/t had 2 1/4" aluminized tail pipes, my road runner didn't.
Posted By: lewtot184
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/21/13 02:39 PM
l was looking thru two service manuals, 1965 and 1969. if one looks closely at the schematics of the exhaust systems it is clear that only 440's and hemi's had the muffler clamped to the exhaust pipe. also, if one reads the instructions ('65 and '69 manual and i seriously doubt '68 would be different) for muffler removal (non-hemi) it clearly states to hacksaw the muffler off the exhaust pipe, which is what i had to do. 383 mufflers and 440 mufflers were different. a concourse correct 383 road runner would have a 2 1/4" muffler butt welded to a 2 1/4" exhaust pipe.
Posted By: stateline
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/21/13 08:43 PM
Quote:
Butt weld would never be factory!! Sometimes on those new cars we at the dealer would put a couple of small welds at joints so the pipes would not twist and or come apart. Other times we drilled a small hole and put a small screw through the joint.
As I remember the mufflers were the same length on 383's and 440's. [/quote
back in the 60s alot of the Chry. mufflers were butt welded to the head pipe as installed at the factory( no muffler clamp ) and the outlet was clamped to the tail pipe.- in the late 60s I mechaniced at a Chry.dealer - I cant remember the specifics of which cars were this way or if all were this way but we would cut the muffler off as close to the muffler body as possible and the replacement muffler was sized to slip over the pipe I thought about bringing this subject up before but figured the response it would get here. There was a feature on a big buck 440-6 Cuda in a mag. it showed the resonators welded to the head pipes which I figured was assembly line correct
Posted By: lewtot184
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/21/13 09:22 PM
"i thought about bringing this subject up before but figured the response it would get here",....ain't that the truth! typical moparts.
Posted By: Mike Mancini
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/21/13 09:56 PM
Does anyone have pics of original 383 mufflers?
Posted By: JohnRR
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/21/13 10:44 PM
Quote:
Does anyone have pics of original 383 mufflers?
put your money where your mouth is ... typical moparts .... 
I have a serious question , where they actually but welded or did the muffler slip over the pipe and it was welded ?
Posted By: Troy
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/21/13 10:50 PM
Quote:
Does anyone have pics of original 383 mufflers?
Mike....I don't think anybody does....
Posted By: JohnRR
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/21/13 11:00 PM
Quote:
Quote:
Does anyone have pics of original 383 mufflers?
Mike....I don't think anybody does....
There is a 27k mile original 69 RR on the 'bag I don't know it it has original exhaust on it , it looked to shiney , but it appeared to have welded mufflers and they were crushed corner like the original Hemi mufflers .
Posted By: Troy
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/22/13 12:20 AM
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Does anyone have pics of original 383 mufflers?
Mike....I don't think anybody does....
There is a 27k mile original 69 RR on the 'bag I don't know it it has original exhaust on it , it looked to shiney , but it appeared to have welded mufflers and they were crushed corner like the original Hemi mufflers .
I already looked (I like that Road Runner!!) It has aftermarket exhaust on it.
Posted By: lewtot184
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/22/13 01:19 AM
Quote:
Quote:
Does anyone have pics of original 383 mufflers?
put your money where your mouth is ... typical moparts ....
I have a serious question , where they actually but welded or did the muffler slip over the pipe and it was welded ?
they were butt welded to the exhaust pipe on 383 and down engines.
Posted By: stateline
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/22/13 02:38 AM
Quote:
Quote:
Does anyone have pics of original 383 mufflers?
put your money where your mouth is ... typical moparts ....
I have a serious question , where they actually but welded or did the muffler slip over the pipe and it was welded ?
John , the muffler inlet was actually part of the head pipe,it didnt slip over the head pipe. I think they were built this way to speed up assembly on the line , the head pipes were installed on the cars with the mufflers already on the head pipes. I looked but cant find the feature on the 440 -6 Cuda I mentioned earlier that had the exhaust restored this way
Posted By: moparpollack
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/22/13 03:30 AM
Quote:
Quote:
Does anyone have pics of original 383 mufflers?
Mike....I don't think anybody does....
My car has he original exhaust I won't be able to get pictures until Saturday. 
Posted By: JohnRR
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/22/13 04:17 PM
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Quote:
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Does anyone have pics of original 383 mufflers?
Mike....I don't think anybody does....
My car has he original exhaust I won't be able to get pictures until Saturday.
And thanks for the answer on how they were originally, I don't think I have ever seen an original unrestored 68 or 69 roadrunner up close. there was supposed to be a 6000 mile original 69 in the town I grew up in , the owner went off to war and didn't return , I've never seen that car surface as far as I know ...
Posted By: pnypwr
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/25/13 02:01 PM
i remember the orig mufflers I took off my 68, i may have a pic on film ill see if I can dig it upI remember they had the corners knocked in wasnt an oval like a traditional muffler of today, and it had turndowns no tips 68 383 hardtop I need to find the picture book of that car, I put it together in the late 90s, had 54k on it and got hit in the nose in the mid 70s sat in a parking lot blown up untill I got it...idk if the motor blew bufore during or after the crash, but it dropped a valve in number 6
Posted By: Silverbullet2
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 02/25/13 06:46 PM
I had a 69 GTX in high school that came with the original exhaust. I'm pretty sure I don't remember any joints between the mufflers and H pipe on it either.
Posted By: Mike Mancini
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 06/18/13 02:54 AM
Still looking....anyone have pics of any B-body 1968 383 mufflers?
Posted By: Anonymous
Re: 1968 383 Roadrunner Assemblyline Exhaust Questions - 06/21/13 03:56 AM
Dave at ECS might have some original set ups. Have you tried him yet?