Inliners International Forums General Discussion Hi Performance 3-1barrels or a 6 pack

i am restoring a 70 gmc w/a 292, i want to rebuild the motor with falt or dome top pistons, but i don't know if i want to go with 3-1 bbls carbs or a 6 pack.

pat

Run three 45 DCOE Webbers,best thing out there besides fuel injection.

MBHD

where do i get weber carbs?
pat

I am running 3 of Langdons 5200's on an Offy intake on a 292. I am well pleased with their performance. I have a Weber setup also. I am so pleased with the 5200's that I have not bothered with the Weber's. One thing to keep in mind, is the Webers must be tuned to it's application. This takes time and also could get expensive. The 292 is in a pulling tractor. So it usually runs in the all out mode. Hope this helps.

You can find some here: http://www.webercarbsdirect.com/45_DCOE_p/19600.060.htm
They're not cheap.

Hi,

Here's a photo of my "six-pack" set up.
A 1970 Suburban 292, bored .040, Wolverine 270 cam, ported, polished, Offy intake with Langdon's 5200 H/W's. Installed them in 2000 and never have touched them since. I have them running a little rich with #49's in the primaries and # 52's in the secondaries. All electric chokes hooked up and a water heated intake. It starts up with the first turn of the ignition and has goobs of torque and very adequate HP! A T-5 tranny and 3:55 nova rear. Why spend the $$$ for Webers when reliability comes at a better price!

RapRap
1940 ChoppedChevyCoupe

Once again, Sweet ride Bob.

How is your log ram manifold coming??

Greg,

I sold the log mainfold and carbs to a fellow hotrodder last summer. I was at a crossroads with it and he made me an offer I couldn't refuse.
I am now re-designing another intake that will be more efficent and modular than the my first attempt. That was a sweet first attempt but I learned a lot from it. When I get a design rendered, I'll post it.

RapRap
1940 ChoppedChevyCoupe

Good stuff! I am looking at using an Offy 3x1 intake, and now have more questions....Can holley 2 bbls be adapted to this? WIll the 3x1 produce decent power? Not planning on racing, just want to be quick! If 2bbls can be used which ones are best.
thanks

Yes, the 1bbl-to-2bbl adapters exist and can be purchased from www.Stoveboltengineco.com
You can also find the Holley Carbs there too.

The Holley/Weber 5200 series is a great all around carb. Not a lot of upkeep to keep them running. Carter 2bbls or even Stromberg 97/94's will work. I suggest to stay away from the Strombergs as they are hard to find with out leaking throttle shafts and warped bases as they are 50+ year old carbs. Also the rebuild kits don't last long if you use re-formulated gas. It eats through the gaskets quicker!

RapRap
1940 ChoppedChevyCoupe

I would respectfully partially disagree.

First, Stromberg made the 97 (and were proud enough to put their name on ALL of them); Holley made the unmarked 94's.

The Stromberg 97 is a special case (for Ford) of the standard Stromberg EE-1.

The 94 is a special case (for Ford) of the Holley AA-1.

The major problem with the Stromberg 97 is the use of only 5 airhorn to bowl screws, which permits warpage of the airhorn. This must be corrected using a special jig, heat, and pressure. Stromberg gaskets are no more susceptible to RF fuel than any other. Occasionally, we find a badly worn throttle shaft, but shafts are readily available. Not saying they do not exist, but I have never seen a warped Stromberg base.

The major problem with the Holley 94 is the economiser diaphragm located in the bottom of the fuel bowl. These are susceptable to RF fuel, and when they fail, drain the bowl into the intake manifold. as there is a direct passage from the ecomomiser through the throttle body.

The Stromberg economiser valve is a brass valve with circuitry that, when open, simply augments the main metering system (discharges through the main discharge jets).

The Carter 2 barrels utilize the metering rod principal, thus no separate valve.

Jon.

would 3 dueces be too much on a 230 with raised compression? (Flat top pistons from a 283 or is it 307?)

That will depend on the Head work and cam as well,
And the size of the dueces you plan on Useing.
As for the pistons It is the 283s for the 230 blocks.

In a different lifetime (well, much younger anyway), everyone's favorite Uncle endowed me with a year's expense paid visit to Asia. While there, I owned a car which came from the factory with 4 1-barrel carburetors. The engine was 37 CID.

The amount of carburetion which may be supported by an engine is dependent on the air flow requirements which are dependent on the displacement, cam, headwork, and maximum RPM.

The key to (3) 2-barrels on a 230 would be in picking the 2-barrels.

Three 1-barrels would be easier to set-up, but 3 2-barrels is a possibility, assuming you can find (or fabricate) a 3 2-barrel manifold.

Jon.

Thanks Jon and Larry!

Great stuff, went by the National sprint car hall of fame in Knoxville Ia, last night, met a fellow inliner! I know this may not fit here, but we were just talking about Stromburgs, and lo and behold there were about a dozen or more just sitting on all those beautiful cars from the 50's and 60's! Great trip worth the effort to go!

I put 3, 200 CFM Holly bugsprays on my 261 with a custom manifold. Took a year and a day to get it all working properly and at that it was just a bit too much untill I made it progressive. I think Tom Langdon makes a 3X2 useing the Holly/Webber progressives. That is suppose to work real well on some of the six's.

I have a 302 GMC with 3 Weber 32/36 DGVA progressive carbs on it. I believe they are similar to the Holley/Webers referrded to above. I have them on a home made manifold that consists of three tapered steel 90 degree bends feeding the ports. The three bends are connected by two rubber balance tubes. The carbs were designed to feed 1600 cc engines which is about 100 cubic inches or coincidently 1/3 of the GMC displacement. They work great. I got 17.5 mpg on a 200 mile trip in a 3300 lb 1940 Chevy going 60 -70 mph. Acceleration is very strong as well.