Carb question/opinions...Chevy 250, 6 cyl.

[Donzie]

Currently I have a single barrel on the 250. I strikes me as being under carburated. Should I get an adapter and use a 2 bbl. or go to a 2x1 intake? It would seem the first option would be easist but which is the best? By running the 2 singles wouldn't the gas be better distributed? Also, what problems might I encounter changing the manifold?

[Foul]

About anything you decide to do should take place after you've already put headers on that engine. You won't realize any gains until you're able to evacuate.

That said, I've seen some great 2x1 and even 3x1 setups that involve a little more time and effort, but are worth it in terms of coolness and fuel distribution. Have some pictures at home I cribbed off of here a while back. I'll post em if nobody beats me to it.

Another pretty popular option is to find yourself a Clifford or Offenhauser 4bbl intake and get a 390cfm Holley - anything bigger would overcarb that engine. Also make sure to have your primaries and secondaries parallel with the cylinders if you run the 4bbl (90 degrees to a conventional 4bbl V8 setup). That's a point of contenion among the six guys - some don't think the hassle of extra linkage is worth it, but you'll likely run the front cylinders lean and the backs rich the other way.

another possibility I'm tossing around is the South Ameican MPFI setups. Should be a bolt-on, but I haven't been able to find much information. Or a poor Mexican to go down there and get one for me.

problems changing the manifold come in the mounting system. if you look at it now, you've got clamps holding the manifolds down. depending on which header and manifold setup you choose, you may have to engineer another way to mount the manifolds.

good luck,
dan

[Fat Hack]

Holley used to make a replacement 1v for the stock carbs on those...had one on a stock 78 Nova with a recurved distributor, and that little car ran STRONG for a straight six!

I think those carbs were actually called "Economaster", but they did wonders for performance...and fit where the stock Monojet went!

[choprods]

Like tha man said....open up the exhaust flow-THEN put on a one barrell from the same vintage 292 truck six!=looks stock runs fast! http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gifsleeeepppppeeeerrr.

[bigron]

i'd like to see someone come up with a tbi setup. i see so many cars in the junk yard with fuel injection. anyone know of this??

[Foul]

DIY EFI: http://www.slantsix.org/articles/dibiase_efi/efi-conversion.htm

as for those pics, I cribbed these off the HAMB a couple years ago. anybody remember who did this?
http://danielstrohl.com/fourbyone.jpg
http://danielstrohl.com/sixappeal.jpg
http://danielstrohl.com/sixappeal2.jpg

dan

[Grumpy]

BTTT...and since I know this car(hehe..it was mine). It has fresh split manifolds and duals out the back using 12in. glasspaks.
Just trying to help Donzie!! http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif

[bigron]

hey thanks for efi conversion info.

[Donzie]

Thanks for the input Grumpy, I forgot to mention the split manifold.
Ok, Holley 1 bbl or a carb off a 292. Both of these sound affordable and pretty easy to do. At this point in time I don't have a lot of spending cash for this update. I have several "must-do" things that need to be addressed. Anyone have one of these carbs, preferable that doesn't need to be rebuilt (I'm a lazy bastid)? One other thing I'd like to do under the hood is switch to a Pertronix set-up.

[41ChevyTrucker]

You could use one holley/weber progressive carb on the stock intake. You can get them rebuilt from langon's stovebolt engine co. I think I paid $60 and then you need an adapter which is mabe $10? I have two of them on an offy intake and they work great. I also got the air cleaners from him.

edit: here's a pic

[Levis Classic]

Donzie,

Check out the setup kustombuilder just bought for his 47 Chevy. 2x1 nice setup. I got a bunch of carter W-1's for rebuilding which work great in a 2x1 intake setup.

[Donzie]

So, if I want to go the 2x1 setup what intake do I need to fit the 250?

[raven]

Langdon's Stovebolt has 2x1's for the 250.
They also have 1x4 intakes for the 250.
You can get HEI's for them as well as conversion kits for the stock distributor.

That leads to my question...
I'm wanting to warm-up my 250 and can't decide on whether to go with 2x1, 2x2 or one four.
My plan is to drive every day.
Any thoughts why one would be better over the others?

r

[Donzie]

[ QUOTE ]
That leads to my question...
I'm wanting to warm-up my 250 and can't decide on whether to go with 2x1, 2x2 or one four.
My plan is to drive every day.
Any thoughts why one would be better over the others?

r

[/ QUOTE ]
I'll second that!

[raven]

Maybe we can get someone to pipe in later today...I hope...
r

[Foul]

a bit out of my league, but I'd guess two H-W progressive 2bbls would give a decent amount of punch along with good in-town mileage and better fuel distribution than a Holley 4bbl. hit up some of the experts at inliners.org for more info, though.
dan

[Rocky]

I ran a Q-jet on a Clifford intake on my 292 chevy. When coupled with the clifford headers, I hadda richen it up substantially. It was easier to take the carby back and get one for a Caddy... Worked great. I never experienced fuel distribution problems and when those secondaries kicked in? Varoom!

[41ChevyTrucker]

[ QUOTE ]
[ QUOTE ]
That leads to my question...
I'm wanting to warm-up my 250 and can't decide on whether to go with 2x1, 2x2 or one four.
My plan is to drive every day.
Any thoughts why one would be better over the others?

r

[/ QUOTE ]
I'll second that!

[/ QUOTE ]

I have heard good things about all of the above. I talked to a guy not long ago who swore by 4 barrel on inlines for daily drivers. When I talked to Langdon he sold me on the two progressives. I like the performance of the two progressives but I think dual or triple singles look better.

To add to the choices I read on the inliners board from a guy in Brazil they are heavy in to 250's for racing and rodding. Supposedly they all use a single two barrel Weber 40 or 44 downdraft and claim it is the best. Clifford Performance also recommends the single two barrel weber 40 for 250s and the 44 for 292s when using a bigger cam. I actually bought a weber 44 when I first got my inline before I did my research and learned it was overkill for my stock 235. (I was blinded by the velocity stacks http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif)

[el Roach]

I'm currently running an Edlebrock 500 cfm 4 bbl on my T with a 250 in it. It's been running rich so I tried to step down on the metering rods (their recommendation) but it didn't quite have the snap. I'm still contemplating messing with it some more or changing over to an adapter to run 2- 94's.

[Bruce Lancaster]

I haven't installed it yet because I spend all my time on the old cars, but I've collected a Q Jet setup for my nova six. Offy manifold, adapter sideways, and some linkage from a later integral manifold six that had the linkage coming over the valve cover sideways like I need. I went for a Q Jet from an engine of similar size. One year only (I think) of late Chevy small trucks with the approximately 250 inch 90 degree V 6 had a non-computerized QJ. I think it was about '85 or '86.

[kustombuilder]

hey Donzie, get ahold of VAPHEAD about an intake, he got me my 2x1 for WITH linkage for $170 (free shipping included) and it is an Offy. looks real killer, get it on soon, i hope. like Brett (LEVIS CLASSIC) said, he has a bunch of W1 Carter 1 barrels, i bet he hooks you up REAL good with a couple cores. rebuild kits are $30 each from VAP, i never shopped around though so you MAY be able to get a better price on the kit. the kits i have are VERY complete though and have all kinds of neat little parts that i assume go inside the carb somewhere http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif...

good luck, and whatever you do, DON'T TAKE THAT OUT A PERFECTLY GOOD SIXER JUST TO PUT IN A SBC!!!


P.S. i like the idea about turning the 4barrel 90 degrees, i never thought about it but that makes alot of sense to me.

[AHotRod]

Can Eric ( Vaphead ) still get those manifolds??????

[old dirt tracker]

if you want cool than maybe multi carbs are the deal. if you want efficiency than look to what the oem manfacutres have done. a progressive 2 or 4 barrell would be best, something with a small primary and a large secondary.