Dual carb idea for my sixbanger. Inputs

I have a 250 six in my 50 sedan. I exentually want to go with a dual carb setup. I do like do try and be a little bit different too. Anyway I got a line on a Offy 4 barrel intake for dirt cheap. Well the dim light bulb in my head came on and I though it might be different/cool to get a 4bbl to dual carb adapter from Vintage speed and run a pair of Holley 94's. I did a little searching and the Holleys are not the expensive and are rated at about 175cfm each depending on the model. I've seen this setup on smallblocks and it doesn't look to bad.

I reall know nothing about 94's. Are they decent carbs? east to reubuild and tune?
Here is a pic of the adapter I am thinking of. Thanks as always, Todd

 

Personally I think dual carb adapters look gay.

94s are not bad to work on.

 

If you're going to buy the intake, buy the adapter, buy the carbs and buy the components and rebuild kits, then just buy the split intake and be done with it...I know it's expensive and all, but there's no sense in buying 2 manifolds and an adapter for the same motor...or find someone to make a split intake for you, there's still guys that'll split the stock cast iron ones or fab up tubing style ones...good luck man...

 

so.....the way you tell a part is "new" is that it says "vintage" on it?

 

There is one for three carbs at http://www.offyparts.com/product_in...d/233?osCsid=9cbb08265172808dd08106ac81dcf292

I use this one, for two carbs, with Rochester pot bellies. Carter yf with the larger size venturi will also work well.

http://www.speedwaymotors.com/Chevy-6-Cylinder-Dual-Carb-Intake-Manifolds,813.html

 

Seems to me the Clifford 4bbl intake would accept that 'vintage speed' adapter you pictured, but,(second to my home-made one, of course,) I prefer the offy setup to the Clifford.

 

Why not just run a 450-500cfm 4bbl and get it all tuned and adjusted and call it good from there? Sure, you'll catch a bit of flack about it, but not nearly as much as running an adapter and dual 2bbls...I still say it's not wise to buy one setup just to save up for another setup later, but lots of things we do are irrational at the time (like when I wasted 2 days installing a '78 Pontiac posi rearend into my '40 only to yank it out a week or two later to put the '61 Pontiac Powerlok rear in instead)...

 

Search for Tom Langdon's stovebolt. He has the 2 carb offy intakes with adaptors to put two holley-webers on for carbs. This is I believe the most streetable dual carb setup for the inline 6.

 

Here are a couple I have built:

two SU side drafts



three singles on a home-built intake made from three stockers

 

Holy **** man, that 3x1 intake is pretty ingenuitive...did you have to modify the mounting pads or anything to make the center port of the manifold fit the outer ones?

 

Neat. I'm going to save that picture for a project in the future. I'll wait until the stock intakes present themselves at swaps, etc.

 

If your looking just to get it going til you find a 3 carb setup later just put a holley 2bbl on it , it will wake the motor up . You can always sell the Offy intake later so grab it if it's cheap

 

Holley 2bbl on stock intake manifold? Noticable gain, even with stock exhaust?

 

I am running 2 singles on a mopar 230 6. I am using a fenton intake. Now we all know that the factory manifolds, and ports were not designed for high perfromance, and as **** likely sized very conservatively. And an engine will only be able to **** in so much air, which is probably limited more by inlet size than pump size. Bernulli's laws applies and such. So you gotta ask yourself how much an improvement you are going to get if you pile stuff atop the same size inlet hole. So if you are gonna add carbs, shouldn't you be adding inlets??? Kida like the NASCAR restrictor plate deal. I think you should look into at least a proper manifold for what ever carbs you are planning to run.


check out langdonsstovebolt for other carb and manifold options.

 

Dude....being a little hard on the guy, aren't ya????? He ain't got noexperience......be gentle....

 

i'm for no adaptor, intake made for number of carbs. 250's are great!

Squirrel thats funny, could be true and confusing to some.

 

I believe you meant Venturi's laws and not bernoulli's...intakes aren't meant to provide lift so you can fly

 

Nope talking flow and speed of flow through restristions, not low pressure caused by speeding up the flow.

 

GMC Bubba made one from a stock intake. It's on here somewhere. It had 2 gl*** bowl Holleys on it. Also you mentioned a stock exhaust manafold. Try and find a 292 one. They have a larger outgoing pipe size 2 1/2".
Good Luck.

 

No, the only mod required was to make a longer hold-down clamp for the front carb as the mounting lug at the bottom of the original 1V carb under cyls # 1&2 is set a little further forward wrt the port than the back four, by maybe 1/2". Simple fix.

See www.inliners.org under "tech tips" for additional photos.

 

94 and 97s look cool, but they are a poor design (start the hate mail) they leak badly and have to be tuned all the time. They are a real pain in the *** for a driver.

 

i bought this set up from patrick's antique cars and trucks. they went above and beyond to make sure i was happy with my order.

 

I'd get the 4 bbl intake and put a 390CFM Holley on it. that's what I got for my slanted Dodge six.

my brother has a clifford 2-4BBL intake for a late Chevy six. he's been using it as a doorstop. so you could get 2 of those adapters and run 4 carbs if you hads one of those.

 

Yep. Did it on the Ford 300 6 in our 4x4's , lot more power and still same gas milage .