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51 3100 - 235 exhaust question
#1380889 Thu Oct 15 2020 08:32 PM
Joined: Apr 2019
Posts: 138
J
JD1 Offline OP
Shop Shark
Hi. I am looking for some input.

I am converting from stock exhaust manifold with single exhaust to Fenton headers dual exhaust and glasspacks.
I plan to use the stock intake manifold and heat the manifold.

Has anyone used the exhaust heat to heat the intake manifold? I was wondering how that works compared
to the water method that Langdon shows on his website.

Does anyone have opinion on a particular glasspack muffler?

What diameter exhaust pipe do people recommend?

I am looking for a little exhaust rumble but I'm not looking for the 18 year old straight pipe no muffler sound. lol

Thanks guys.
Joe
'


1951 Chevy 3100 1/2 ton (1957 235, 4 speed, 411 rear)
Re: 51 3100 - 235 exhaust question
JD1 #1380891 Thu Oct 15 2020 08:58 PM
Joined: Sep 2001
Posts: 30,570
ace skiver
Joe,

I have done it both ways (with one or two carburetors)
Will you be using one or two carburetors?

Some people will tell you that two carburetors on a 216/235/261 stovebolt engine is just eye candy (so what, if they are a good match to your engine). What carburetor/carburetors are you using?

Manifold heat is easier/better with regards to messiness if/when you get leaks.

I either case, water or exhaust-gas, what intake and exhaust manifolds will you be using? Some/most dual carburetor intake manifolds (and adapter plates) do not move the "coolant" as follows:

into one side
and then side-to-side
and then out the other side

If you post a photo or link to the opening on the bottom of your intake manifold, I/we can post further comments.

With regards to mufflers. why glass pack?

Stock 235 mufflers are straight-through, with baffles.
Nice mellow sound (a little "rapping"), with little/no back pressure.

You might get replies that tell you that this is all "eye/noise" candy.
Even though they are mostly correct, ignore them.


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: 51 3100 - 235 exhaust question
JD1 #1380892 Thu Oct 15 2020 09:02 PM
Joined: Aug 2018
Posts: 275
D
Shop Shark
Joe, I can't speak to the Fenton's, but I'm running an old school split manifold, split exhaust (dual) with 1-3/4" pipes to long glasspacks (brand unknown), then out the back, on one of my vehicles, a '53 Bel Air with 235/Powerglide. The exhaust system was installed sometime in the '60s when the engine was replaced with a '54 235, from what I can piece together of the vehicle's history. It's not loud, but it has the rap that is the signature sound of the split exhaust. If I need to replace the mufflers at some point, I will use Smitty's, also famous back in the day.

Here's a short sound clip.

Doug

Attached Files
Short Split Exhaust_Trim (2).mp4 (769.65 KB, 44 downloads)
SHA1: 9d470fa1b011ff3b7ef447f5abdacd577f1cf5c8
Split Six Cartoon.JPG (55.12 KB, 101 downloads)
Re: 51 3100 - 235 exhaust question
tclederman #1380924 Fri Oct 16 2020 12:31 AM
Joined: Apr 2019
Posts: 138
J
JD1 Offline OP
Shop Shark
I am going to run one carb (carter 32/36) on stock manifold. I really like the way the truck is running at the current time.

I was planning to buy the Langdon intake manifold plate.

Why glasspacks? Just looking for that old school exhaust sound. Is there a better option?

What is stock 235 mufflers straight with baffles?


1951 Chevy 3100 1/2 ton (1957 235, 4 speed, 411 rear)
Re: 51 3100 - 235 exhaust question
drdoug #1380932 Fri Oct 16 2020 01:13 AM
Joined: Apr 2019
Posts: 138
J
JD1 Offline OP
Shop Shark
Sounds good Doug. Thanks for the clip.


1951 Chevy 3100 1/2 ton (1957 235, 4 speed, 411 rear)
Re: 51 3100 - 235 exhaust question
JD1 #1380933 Fri Oct 16 2020 01:29 AM
Joined: Sep 2009
Posts: 321
G
Shop Shark
The stock muffler was similar to a lot of tractor mufflers you see on old farm tractors. Rounded shape, straight through design. I'm running one of them that I got from Jim Carter truck parts in Kansas City. I like that it is not whisper quiet, but also does not have that annoying glasspack raspping sound. I love glasspacks on V8s, but our inline 6s sound terrible with them.

http://www.oldchevytrucks.com/Articles/Muffler-Tech.php

PM me if you want to hear my truck, i'll text you a clip of it.

And about the dual carb thing...does anyone actually have dyno proof that (2) 1-barrels provide any substantial power gains? My guess is it would mean more maintenance since you would have to run each one so lean.

Last edited by Green_98; Fri Oct 16 2020 01:31 AM.

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

Re: 51 3100 - 235 exhaust question
JD1 #1380934 Fri Oct 16 2020 01:30 AM
Joined: Jan 2013
Posts: 1,830
Shop Shark
If the truck is running well, then why change it? Just change the muffler and drive it. I would hate for you to start messing with it and then it doesn’t run as well. Just my thoughts.

Chris

Re: 51 3100 - 235 exhaust question
JD1 #1380938 Fri Oct 16 2020 01:53 AM
Joined: Dec 2017
Posts: 825
D
Shop Shark
The other option is to simply add another exhaust outlet from the stock exhaust manifold. Otherwise you will need to make a plate for the stock intake like this:

http://www.langdonsstovebolt.com/store/#!/Heat-Plate-for-235-261-Inlet-Manifold/p/1222049/category=18665950

Then you run copper lines from the fentons and use exhaust heat. Or in the alternative, run hot water.


Mike

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