The Stovebolt Site Forums The Shop Area Engine Shop Quick carb question

Just wondering if it would be worth it to replace the stock one bbl with a new two bbl elec choke carb. Also can it be adapted to the stock intake manifold. I'm thinking it may give me a bit more power and a newer carb would present fewer starting problems.

Thanks....what a wealth of information you guys are

If your original one barrel carb is rebuilt, and the truck is in tune, or even close to being in tune, there really aren't any starting problems to speak of.

You might find it better value to spend a small portion of what a new carb would cost, doing a full tune up, and rebuilding the carb that's on there already.

I guess I knew that would be one answer. I have read, however, that a progressive two bbl would perform better and get a bit more power and modern technology. As I understand it a progressive two will basically only use the second bbl once you get above, say, 40mph, but I could be wrong. I do agree, though, that a tune up will surely help as will replacing some leaky gaskets and getting the choke working correctly. Not sure who around here can really re-build a carb correctly either.

The progressive two just made some sense to me.

The adapter will reduce most of the benefits of a two barrel. Trying to neck down a bigger carb to a small intake just doesn't perform all that well. Also, you would need a progressive two barrel approximately twice the size of your one barrel since it would be only using half of it most of the time. Most likely what you have read is how good progressive's perform when running dual carb set ups. Here they work in pairs so the two primary barrels equals the original carb size, and the secondaries add slightly more cfm when opened.

Just running one would be way undersized so you would be into the secondary most of the time just to keep it running.

Jo

Thanks Jo,
So you're saying to run two two bbl carbs with progressive linkage ? Or two one bbl with progressive linkage ?

I believe what is being sold for dual set ups is a progressive two barrel. These use very small primaries and are used together. The secondary barrel is the progressive part.
You must always use dual carbs as one unit, or half the engine would run lean till the other carb opened. If you use three, the two outers can have progressive linkage if the enter carb is big enough to run the whole engine.

Make sense?

Joe

I think there is a Holley-Weber progressive 2-barrel carb that Tom Langon used to sell for the 235 engine.

It might have been a Holley-Weber 740 or a Holley 2300, rated at 350 CFM?

Tim,
I actually wrote Tom about this at the same time I posted my question here. Here is his reply from this AM. With this from Tom I still hear that the two carb progressive set up is the better way to go....not sure what to think/do now.


"Mark,
Yes, you will need the Weber 32/36. Adapter and the 2-1/2" tall rectangular air cleaner.
We can also supply the Williams headers and heat plate when you are ready.
Don't forget the Ignition: - Our MINI HEI can make a big difference."

Mark,

I did not see your question to Langdon but his answer seems to refer to one carb (no plural with "the 32/36"), whatever that is (probably a carb in your question to Langdon? ).

What is the total CFM for whatever Langdon is suggesting?

My experience with Langdon was not the best. He sold me what carbs he had in stock, and then he wondered why I bought what he had personally recommended. I also had to wait for other parts that he never told me that he did not have in stock (dual intake and exhaust manifolds). I ended up with a really nice/smooth/reliable 2-carb progressive 2-barrel (Carter-Webers) set-up that would be excellent on a 235 but they are not enough CFM for a 261. This Spring I'll be selling the whole set up and going with a 2-barrel Holley from a GMC 302 or a 1-barrel Zenith from a GMC 270.

I'd think that running 2 carbs is fine, but not with progressive linkage between the 2 carbs, as Joe suggests, you wouldn't get even fuel supply to all cylinders .... the Weber 32/36 is a 2 barrel, and if you used 2 of them, they would be operating in sync with the "progressive" part being internal to each/both

Bill

Mark,

Is Langdon suggesting one or two 32/36 caburetors? That might be right?

Does anyone know the CFM one Weber 32/36. From an Internet search I find CFMs between 270 -350 for one carburetor. If two of these are being recommended for a 235, is that too much CFM?

Langdon was recommending one progressive two bbl. but word seems to be that the stock manifold is to narrow in the port to really make use of the 2 bbl. I'm so new at this I just have to ask about all this and take the majority opinion

Had a nice informative conversation with a very knowledgable fellow Bolter today and learned a LOT. What a great place this is ! Hopefully I'll learn a lot more as time goes on and eventually be able to help..