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#706170 - Fri Dec 24 2010 10:43 PM 2 bbl carb on a stock intake  
Jeff Ogden  Offline
Shop Shark
Joined: Feb 2003
Posts: 1,456
Dayton Ohio
I have a idea of taking a early 235 and sticking the guts from a 261 in it and some how putting a 2 bbl carb from a Pontiac or Buick straight 8 on the motor,I dont want to use modern parts since it has to look old and still be able to use a period aircleaner. Anybody have any ideas on how I can do it,my thinking was taking that section from the donor manifold and welding it to a 235 intake but welding on cast iron can be tricky.



#706174 - Fri Dec 24 2010 11:19 PM Re: 2 bbl carb on a stock intake [Re: Jeff Ogden]  
andy46  Offline
Shop Shark
Joined: Jun 2010
Posts: 225
washington state
I've thought of similar, but the more I thought about it, the more complicated I made it!
My thoughts were take the two barrel and turn it sideways, feed three cylinders per barrel, using an adapter plate and machining the manifold.
I've heard done up sixes with two-barrels, and they just sound good!
I'm sure what you have in mind is doable easy enough if you have some fabrication skills.
Good luck.


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#706211 - Sat Dec 25 2010 02:06 AM Re: 2 bbl carb on a stock intake [Re: andy46]  
Jeff Ogden  Offline
Shop Shark
Joined: Feb 2003
Posts: 1,456
Dayton Ohio
The GMC 302 six had a 2 bbl but I think thats that is the only straight six GM made that came with a 2 bbl unless they did it in the 70s or 80s,I am wanting this to look like it came out of the factory and not look to be adapted. If I ever build this motor its going to have a little hotter cam and I dont think the 1 bbl will be able to handle it so I was thinking of a period 2 bbl,my thinking behind this is to have a 261 that looks like a 216 but runs alot better and to the untrained eye will look stock except for the fenton headers. I plan on hanging around at some VCCA shows and having some of them scratching their heads looking at my truck with all the modifications disguised.


#706242 - Sat Dec 25 2010 05:28 AM Re: 2 bbl carb on a stock intake [Re: Jeff Ogden]  
6cylindersovertexas  Offline
Shop Shark
Joined: Sep 2003
Posts: 2,433
Beautiful Uptown Hurst, TX, on...
My thought on this was to use two barrels and set up the linkage to run on one each of the two barrels with a burst of power on the second barrel of each two barrel. I started thinking of this when seeing an Edmunds 2 x 2 intake at a meet that takes two Stromberg 94 two barrels. I was told that the 235-261 wouldn't run on one each of those two barrels so I dropped the idea. I never thought, however, about using the later model Chevrolet two barrel, but it may not be able to be linked up like I was thinking. It is an interesting idea, though.

Last edited by 6cylindersovertexas; Sat Dec 25 2010 05:29 AM.

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#706253 - Sat Dec 25 2010 06:25 AM Re: 2 bbl carb on a stock intake [Re: 6cylindersovertexas]  
crenwelge  Offline
Shop Shark
Joined: Jan 2008
Posts: 4,657
Fredericksburg, Texas
A GMC 270 or 302 will run just fine on a Holley 94. 302 Used a Holley that was very similar to a Holley 94. A Holley 94 will do just fine on a GMC. A Holley from a Ford stamped 8BA will run well on a 228 or 248 GMC. All it takes is an adapter to accept a 3 bolt carb. The early 50's Ford would probably do well on a Chev too. If you want something progressive, get a 2x1 manifold with progressive linkage. It allows you to run on one single bbl and then kick in the second. I wouldn't weld anything. Adapters can be made or bought. I have a 3x2 manifold made from the center section of 3 GMC manifolds made for 3 bolt Holleys, but it was some pretty tricky welding and required trueing on a belt sander.


#706254 - Sat Dec 25 2010 06:27 AM Re: 2 bbl carb on a stock intake [Re: 6cylindersovertexas]  
panic  Offline
Shop Shark
Joined: Dec 2008
Posts: 1,057
Long Island
The area right below the carb is pretty small, which means that it's going to favor the #3-4 port, and there's no room to increase the volume. A bigger 1 bbl. is much easier, you only need to move the stud centers.
In order to feed 3 & 3, the siamese center port has to be split - no worky.

The reason the S-94 won't work is that both barrels open together, so you always have 4 working.
But - any split 2 bbl can work (Weber 5200, etc.), and S-bergs have been converted by cutting the shaft in half with linkage on each side.

"sticking the guts from a 261"
Why a 261?




#706258 - Sat Dec 25 2010 06:52 AM Re: 2 bbl carb on a stock intake [Re: panic]  
Jeff Ogden  Offline
Shop Shark
Joined: Feb 2003
Posts: 1,456
Dayton Ohio
It might be easier to get a GMC 302 so I can get a single 2 bbl but it wont look like a 216 plus its longer so it looks like I will need to get the 216 side cover modified to fit my 235 then to do what I was thinking about. I do like the thought of a 261 that looks like a 216 with a hotter cam and a single 2 bbl for a factory look but its just not practical and would be too expensive.


#706264 - Sat Dec 25 2010 07:22 AM Re: 2 bbl carb on a stock intake [Re: Jeff Ogden]  
tclederman  Offline
Joined: Sep 2001
Posts: 24,922
Jarvisburg, NC


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#706305 - Sat Dec 25 2010 04:39 PM Re: 2 bbl carb on a stock intake [Re: tclederman]  
Jeff Ogden  Offline
Shop Shark
Joined: Feb 2003
Posts: 1,456
Dayton Ohio
Could paint the adapter to match the intake so its not so noticable,if GM would have made a 2 bbl intake for the 235/261 this would be so much easier.


#706321 - Sat Dec 25 2010 05:47 PM Re: 2 bbl carb on a stock intake [Re: Jeff Ogden]  
panic  Offline
Shop Shark
Joined: Dec 2008
Posts: 1,057
Long Island
"sticking the guts from a 261"
What are "the guts from a 261"


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