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Re: 235 dual exhaust experiences
JD1 #1393647 Thu Jan 21 2021 06:24 PM
Joined: Mar 2014
Posts: 2,343
When I say "it" above, I don't mean the muffler...I mean the cab. You want to move that noise (which is going to be there no matter what) as far from the cab as possible. One other thing I've found...the round muffler used on these will produce a completely different noise than one of the elongated oval mufflers where there are 3 tubes inside...the middle tube being an unconnected chamber.


1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: 235 dual exhaust experiences
JD1 #1394562 Wed Jan 27 2021 07:41 AM
Joined: May 2004
Posts: 919
Shop Shark
Like TC, I have a stainless muffler from Patrick's. It's actually a Bazani. After I installed the headers, I drove it to the local exhaust shop and let them do what they do for $500. I think mine are 1 and 3/4 to the muffler, and 2" out. The sound is magic. They sing at 2200 rpm!

I also use water heat. I use a dual outlet waterpump and a bypass thermostat housing from a 261. I plumbed it with a heat plate and 5/16 brake line. It works. The difference in warm up time between this and exhaust heat is negligible. What I really like is keeping my new aluminum intake at a lower and more consistent temperature once the engine gets hot. I ran it for a few years with my original cast iron intake and it seemed to work just fine.

My Webshot Photos []
62 Fleetside 4spd 235 w/O.D. posi 3:90
90 Subaru Legacy Wagon AWD 2.2 5sp
13 Ram Tradesman C/V
Re: 235 dual exhaust experiences
JD1 #1394579 Wed Jan 27 2021 02:06 PM
Joined: Feb 2019
Posts: 1,966
AD Addict
In panel fan’s case, he can’t get it (the muffler) from under the cab as it’s a panel van. Just throwing ideas there out but I wonder if an insulated heat shield would help to muffle the sound.

Last edited by Phak1; Wed Jan 27 2021 02:08 PM.


1952 Chevrolet 3100
Project Journals
‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Re: 235 dual exhaust experiences
JD1 #1394587 Wed Jan 27 2021 04:29 PM
Joined: Oct 2015
Posts: 324
My current muffler is left over from the dual exhaust set up and is a Magna flow probably designed to make a bit of noise but I have a long round muffler I used when doing the brake in procedure out of the truck ,I will install that and replace my whining rear end in the spring and hope for the best .
I have until July to get it dialed in to go to The event in Tennessee , if this don't work ,maybe a radio and some head phones ?????


good planning is no substitute for dumb luck
Re: 235 dual exhaust experiences
JD1 #1394879 Fri Jan 29 2021 03:03 PM
Joined: Dec 2017
Posts: 954
I like water heat. Tom Langdon at Stovebolt recommended it to me years ago when he was still working at gm. I still use water heat to this day.

Mufflers for the Fenton's, it depends on what you want sound wise. A lot of guys like the sort of loud rapping sound. And that is ok if that is what you want. I prefer something a lot mellower and frankly quieter. You might consider looking at the Walker Quietflow mufflers. They would remind you of the old corvair turbo mufflers from former days, lol. Mellow rumble, no drone, not particularly expensive.

Re: 235 dual exhaust experiences
JD1 #1395242 Mon Feb 01 2021 02:36 AM
Joined: Sep 2009
Posts: 354
The factory-style muffler available through Jim Carter sounds pretty good. There is a tech article on Carter's website about how truck mufflers were straight-through design, and therefore louder than cars.
While it's not whisper quiet like a car muffler, its also not raspy and overly loud like a glasspack. I have one on my 261 with single exhaust pipe, and it sounds pretty good. PM me if you want to hear it.

Last edited by Green_98; Mon Feb 01 2021 02:37 AM.

1953 Chevrolet 3100
261 / 4-speed / 4:11 / Commercial Red

Re: 235 dual exhaust experiences
JD1 #1395422 Tue Feb 02 2021 03:27 AM
Joined: Jan 2013
Posts: 1,965
I have a magnaflux 20 series on my 216 and love the sound.


Re: 235 dual exhaust experiences
JD1 #1395456 Tue Feb 02 2021 02:11 PM
Joined: Dec 2005
Posts: 50
Wrench Fetcher
I have dual glasspacks and I really like the sound from them....they are not too loud.

1951 Chevy 3100 5-window
261 cu in, 348 Head, Split Fenton Exhaust
Offy with Dual Weber 2 Bbl Carbs
Re: 235 dual exhaust experiences
JD1 #1395522 Tue Feb 02 2021 09:43 PM
Joined: Feb 2001
Posts: 1,371
I have dual hush thrush turbo mufflers on my 261.

59 apache 1/2t
261 short stepside
Re: 235 dual exhaust experiences
JD1 #1395654 Wed Feb 03 2021 10:27 PM
Joined: Mar 2019
Posts: 1,274
i have dual glass pacs on my 261. They are 30 inches long. Really quiet at idle. But wake up some under throttle. Truth be told. I would rather it be alitta louder. Maybe go with a shorter pac, if you go that route??

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