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Old Today, 12:19 AM   #1
Isaiah92260
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2 Bbl Carb conversion

So my truck is out of commission right now. I just rebuilt the 1 barrel Rochester carb for my 61’ 235 straight 6 because it was leaking, I’ve driven it around the block since then a couple of times, but today when I started the motor, it starting leaking like a water fall out of what it looks like the base of the bowl to throttle body.

Anyways after reading many threads about converting to a 2 Barrel 32/36 carb, I’m almost wanting to say the hell with it and throw the damn Rochester 1 barrel away, I keep hearing about how many people dislike them because of how unreliable they are and performance.

Looking more into the conversion I can’t seem to figure out how someone could work out the throttle linkage. I’m finding threads only about the conversion on a 250/292 straight 6’s

Looks like the throttle valve On the carb is facing on the left side, while the stock set up with a 1 barrel is facing on the backside, facing nearest to the firewall, how could I make that work.

I’d love to see a few pictures of anyone’s 235 straight 6 with a 2 barrel 32/36 Webber Holley set up and linkage.
Thank you!
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Old Today, 01:08 AM   #2
18CEOD
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Re: 2 Bbl Carb conversion

Isaiah, I have a 292 with Webers. I fought all kinds of leaks with the manifold and rebuild kits for my Rochester. The Webers are great. In know you said you looked at that application already and maybe the 235 or the specific Weber you are looking at are different than the 292 and my 38s, but my Weber chokes(electric) face to the front and my linkage is on the passenger side of the carb. I made my own linkage and it runs straight back to the firewall and connects directly to the gas pedal. It is not the most professional looking but it works pretty well. It was super easy to build and connect.
I can snap some photos if you think it might help. I have a thread on here asking about Clifford headers and it has a photo of my original setup. If my linkage looks like yours it should be simple.
Sorry Iím not good enough to post a link.
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Old Today, 01:20 AM   #3
18CEOD
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Re: 2 Bbl Carb conversion

Here is a before and during.
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Old Today, 01:33 AM   #4
Isaiah92260
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Re: 2 Bbl Carb conversion

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Originally Posted by 18CEOD View Post
Here is a before and during.
Thank you for your reply, very helpful! Looking at yours and more pictures, I was looking at it wrong, I believe the carb Iím looking at, will sit like yours, so linkage may not be as difficult as I was thinking, I believe I could do something similar to what you did there! What year is your truck? I have a 1961, I think the positioning of the gas pedal and linkage are all the same.

Where did you get the parts for your linkage you made and the carb? Thank you!
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Old Today, 01:53 AM   #5
18CEOD
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Re: 2 Bbl Carb conversion

My truck is a 63. The pedals will be the same. My linkage in the photo is the prototype, I made it adjustable until I found what I thought would be the right length. I made an additional bracket to attach the return spring also. Again not super professional but super simple. I have a couple more photos that might help. Just have to dig them up.
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Old Today, 01:57 AM   #6
18CEOD
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Re: 2 Bbl Carb conversion

Clifford has a manifold and Webers for a 235. Peirce manifold also sells Weber, and I believe Redline might also. I purchased mine through Clifford.
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Old Today, 02:05 AM   #7
18CEOD
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Re: 2 Bbl Carb conversion

Used bar stock and these dodads from the hardware store.
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Old Today, 02:09 AM   #8
18CEOD
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Re: 2 Bbl Carb conversion

Used the Weber part as a template and made my own out of aluminum. The clearance was tight but it worked like a charm. Took a while to find a good spring that would not bind. Iím going to make another one and move the hole back toward the fire wall to see if that helps.
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Old Today, 02:34 AM   #9
Isaiah92260
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Re: 2 Bbl Carb conversion

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Used the Weber part as a template and made my own out of aluminum. The clearance was tight but it worked like a charm. Took a while to find a good spring that would not bind. Iím going to make another one and move the hole back toward the fire wall to see if that helps.
Man thatís a nice set up! How do you like the performance? Hope you donít mind if I steal your idea! Iím going with just a single Weber and get the adapter to use the stock manifold, keep it simple
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Old Today, 02:36 AM   #10
Isaiah92260
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Re: 2 Bbl Carb conversion

How are you attaching the return spring and the bracket you made?
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Old Today, 02:53 AM   #11
18CEOD
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Re: 2 Bbl Carb conversion

It really woke up the motor. Iím fighting some fuel delivery issues now, but that is pump and tank related. Also Iím still running the manual granny tranny. Iím real quick and torquey between 2nd and 3rd.
The return spring is attached to the bracket I made at the rear of the carb. Itís hard to see in the photo. Itís right under the linkage in the photo. The spring looks like a silver tube in this pic. The bracket is bolted on using the bolt that mounts the carb to the adapter plate on the manifold. Iíll get a better pic in the morning. I really need to move the spring hole back though. I think it would help.
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Old Today, 09:49 AM   #12
Indychus
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Re: 2 Bbl Carb conversion

Not in a C10, but here's the 235 that was in my 52 Styleline with a pair of Webers. I think I used a langdon linkage kit and I found the carbs cheaper elsewhere. IIRC the carbs are for a 70's model Ford Pinto.

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Old Today, 12:44 PM   #13
18CEOD
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Re: 2 Bbl Carb conversion

I totally forgot about Tom Langdon. Also the other Tom at 12bolt. He was very helpful when I had questions about my inline.
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Old Today, 02:07 PM   #14
Isaiah92260
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Re: 2 Bbl Carb conversion

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Originally Posted by Indychus View Post
Not in a C10, but here's the 235 that was in my 52 Styleline with a pair of Webers. I think I used a langdon linkage kit and I found the carbs cheaper elsewhere. IIRC the carbs are for a 70's model Ford Pinto.

Attachment 1838986

Attachment 1838987
Thatís a bad ass set up you got there! Iím wondering how just one Weber on a stock mamifoldwould do compares to those you have!
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Old Today, 02:09 PM   #15
Isaiah92260
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Re: 2 Bbl Carb conversion

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Originally Posted by 18CEOD View Post
I totally forgot about Tom Langdon. Also the other Tom at 12bolt. He was very helpful when I had questions about my inline.
Sweet man thanks for that info! Iím gonna call both those guys a call!!
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Old Today, 02:13 PM   #16
Indychus
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Re: 2 Bbl Carb conversion

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Thatís a bad ass set up you got there! Iím wondering how just one Weber on a stock mamifoldwould do compares to those you have!
A single would probably be fine. I liked the webers much better than the rochesters. I rebuilt my rochesters constantly and had a shelf full of spares and parts. The webers just worked. I went from the single rochester to 3 rochesters to the dual webers. By far the webers were the most reliable and responsive.
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