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2 barrel question


Say good bye to my "Dorky little pipe"

1969 beach2aa.jpg

This week I am upgrading to dual exhaust from the current low flow system.

I have been told that this new free flowing system may not agree with my carburetor settings.

I'm looking for thoughts from those whom had experience with a 2 barrel, dual exhaust set up.

Thanks in advance.  



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Randy(Muttwood)



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That will be a nice upgrade. I have owned a few Catalinas with the 2 barrel carbs, but when I upgraded to dual exhaust I always upgraded to a 4 barrel manifold and carb. If it turns out you feel a problem, you can change the jets rather easily, with a sacrifice on gas mileage.



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'69 427 2+2 Convertible


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My 69 had a 2 barrel and dual exhaust when I got it and ran great..went to a 4 barrel and hei after..just cuz a upgrade I guess

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The 350 2bbl engine wasnt offered with dual exhaust as an option. Not sure why as the 350 4bbl engine did have duals as an option and both had the same exhaust manifolds so the systems would interchange. Given the restrictive size of the two barrel carb Venturi you might have no gain whatsoever by adding duals. I cant imagine any negative other than a slight loss in low rpm torque.

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John

Montreal 

16 1969 American Pontiacs

and a 1969 Canadian 2+2 Hardtop



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Thanks guys

"Dorky little pipe" is a quote from a member in fun.

I'm not really looking for a performance improvement but I have been warned about it leaning out the carb.

My single muffler is failing (actually cracking) so I decided to full system of all welded 2 inch with a small sound increase.

To my knowledge, my motor has never been touched other then a carb rebuild so for now,

The two barrel stays,

Maybe I will flip the lid on the breather L.O.L.

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Randy(Muttwood)



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When I bought my 66 in May 2016 it had a real nice dual system with an H pipe on the 283. Ran fine, sounds great, never noticed an issue with it. I wouldn't be shy at all to run duals with a 2 barrel.



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1966 Strato Chief 2 door, 427 4 speed, 43,000 original miles


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A dual system will be loafing until you put your foot into it anyway. Reducing pumping losses (back pressure) increases efficiency. If you are as worried about noise as the GM engineers then you could run resonators with the duals like the factory did (if you can find them anymore).

 

Flipping the lid, great idea as your Parisienne is a prime candidate for such a shad tree modification. Just don't eat the decal.



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The car sounds great !

Tommy's Custom Exhaust did a great job bending everything to look close to factory.

Factory on a 1970 Canadian Pontiac that is biggrin

The 350 seems to enjoy freedom from the single system.

I flipped the breather lid for more airflow, just to see if it ran better.

No noticeable difference.

Tips are Canadian Tire cheapies.

tipps.jpg

Forgive me Tommy !

 



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Randy(Muttwood)



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OK, now I have put my foot in my mouth,

The 2 barrel that I had rebuilt in 2017 just fell apart on the inside.

When you step on the gas, the throttle would stick and crunch 1/2 way.

After giving it a good look, I noticed that the arms for the choke and main butterflies were very sloppy.

Even the pumper arm hole is warn.

At that point I decided to do an autopsy since the arm casting holes are worn and not worth fixing.

This thing ran very well for sucking all that extra air.

aug11d1.jpg

The pumper assembly completely fell apart inside

Should look like this;

Image result for rochester 2 barrel pump assembly

This may be a sign from above !

May the 4 barrel be with me ?

Summit has a US made remanufactured 2 barrel. 

I will sleep on this one.

 

 



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Randy(Muttwood)



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Rebuild yours. A carb kit should be pretty easy to source.

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But he says the holes are worn in the casting. I'm with him, buy an assembly line rebuilt or else swap a 4 barrel onto, in which case I'd either buy a known working Quadrajet or else again, an assembly line rebuilt one.

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Somebody must have a decent 69 2 jet sitting around for Randy? Even a better baseplate? I bet Carburetor Rebuilders in TO could bring that one back by bushing the shaft.

What you will notice Randy is your gas mileage on the highway will go up significantly with the duals compared to the dorky pipe. Did you do a crossover?



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67' Grande Parisienne. Ex Ottawa USSR Embassy car, 67- 68.
6977017306_dfca361bfc_m.jpg
 


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cdnpont wrote:

Somebody must have a decent 69 2 jet sitting around for Randy? Even a better baseplate? I bet Carburetor Rebuilders in TO could bring that one back by bushing the shaft.

What you will notice Randy is your gas mileage on the highway will go up significantly with the duals compared to the dorky pipe. Did you do a crossover?


Thanks Mark, I will look into them.

I left the piping up to a guy who has been doing this for a long time.

He asked me a few questions about what I was looking for and I trusted him do what he does best.

Very close to what a 1970 dual system would be like.

He has done 1969 styles before where the pipes wrap behind the wheels.

He even called me midway through the work, to make sure he had things right.

The funny part is that the guy with the 1968, 427 Impala in front of me, seemed to talk down to him.

I bet he gets that a lot.

When all is said in done, he knocked off $50 from the quote.

Todd knows what I did with that $50.00 wink



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Randy(Muttwood)



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Thanks Randy!


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Hi Randy I have my 2 barrel off my 69 I don't think I need ? it ran very good with it just wanted more get up and go ! new ones are not expensive.but if you want a 69 one I understand that.message me and I am sure we can work it out Thanks..



-- Edited by Bill shuba on Monday 12th of August 2019 07:14:29 PM

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I ordered, UREMCO Remanufactured Carburetor 3-3214 from Summit Racing.

"United Remanufacturing Co. has over 60 years of experience in carburetor rebuilding.

As fuel system rebuilders with expertise and stringent standards, they ensure you the best quality at the best price.

They rebuild carburetors from most all automobile and truck manufacturers, and each one is,

individually inspected and rigorously tested on flow-bench engine simulators by seasoned and knowledgeable employees."

They told me "in stock" then "Back ordered until Sept 9th" but it then shows up Monday.

Today I got up early, before anyone had ideas of what I was to do with my day off.

008a.jpg

An exact match.

Installed in no time.

009a.jpg

 

It came with the factory correct fuel filter but I stuck with the in-line system.

I can not believe how well this car runs now !

Took it for a cruise and it's a totally different car.

As they state, each carb has been pretested.

My car fired right up and no adjustments are needed.

Not a real rocket, just a solid, smooth running machine.

The only tough decision I have now is whether or not to send the old one back for a $45.00 US core refund.

 

 



-- Edited by ABC123 on Wednesday 21st of August 2019 03:54:38 PM

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Randy(Muttwood)



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Glad it worked out for you Randy.

Consider running an open element air cleaner when daily, switch back to the stock when show. With the new duals you'll gain a wee bit of mileage and power.



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67' Grande Parisienne. Ex Ottawa USSR Embassy car, 67- 68.
6977017306_dfca361bfc_m.jpg
 


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Very glad it all worked out great for you Randy !!

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I'm glad you saw no due cause to change to 4bbl;
GM put alot of time into these drivetrains, and although a 2bbl doesn't seem as macho as a 4bbl, some people don't realize that some of the GM 2bbl carbs are monstrous compared to the primary side of a Quadrajet!

Although it was typical for GM to match single exhaust to 2bbl drivetrains, if you do some digging, you will find that there are exceptions;
Often the 2bll/singe exhaust drivetrain had a slightly lower hp rating than the 2bbl/dual exhaust;
often the exhaust is the restriction...
The '73 Firebird Formula I owned was a 350/2bbl-dual exhaust;
The same year optional on the base model, and std on the Esprit model was the same engine mated to a single exhaust gains twenty-five horsepower!?

Look here for the specs page.


As you found out, 2bbl stuff is out there, and by sticking to correct/replacement parts, you're keeping your headache level low.



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