Anyone have carb suggestions??

[Anonymous]

This is for the 250 crossflow with a fairly serious street cam and headers. I am using the stock intake manifold which is set up for a small 2V carb, studs are 4" across.

I was just looking at a 2100 off a 289 V8 or a Holley 350. Stovebolt says his little 32/38 will be to small for me but it is the right size physically, really looking for something that that size but flows better.

looking for suggestions from you guys who know better then me!~

 

[Anonymous]

Personally, I am partial to a 2100 with either 1.08 or 1.21 venturis, I think either will work and is easy to find. May require an adapter, though.

 

[cfmustang]

If the Weber 32/36 doesn't flow enough cfm, the 38 is the same size physically but has two 38 ventris instead of a 32 primary and a 36 secondary.

The other difference is the 32/36 is a progressive two-barrel while the 38 is a non-progressive (both barrels open at the same time).

 

[CZLN6]

Howdy Spyke and All:

The Holley 350 or 500 may be the best all-around choice for this application. An Autolite 1.21 is comparable in CFM to the Holley 350, but has annular discharge boosters which is better, but Autolites are no longer produced so you'd have to find a core and rebuild it.

With the flow potential of a 250 with a cross flow head, I'd be inclined to go with a Holley 500. They are infinitely tuneable and parts are easily available. WSA11 just had his converted to annular discharge boosters so he's got the best of both worlds.

That's my two cents, for what it's worth.

Adios, David

 

[wsa111]

David & several other moderators know I have been working on a 4412-500 holley which I had holley install annular discharge nozzles.


I am still in the testing stages of this conversion. When I first installed the carb I had a hesitation & found I had a pinhole in the accerator pump diaphram & a leaking rubber check valve in the accerator pump well due to the flash from the chrome bowl, I smoothed the surface of the bowl & installed another rubber check valve & now my pump shot is chrisp.
I reinstalled my 350 cfm carb for some strip times & acceration tests before I swap back to the modified 500 cfm with the annular discharge nozzles.
The 350 carb is so nice to drive, no stall on cold starts & just very streetable to drive, plus better fuel miliage.

The 500 carb still has to be refined for proper main jets, accerator discharge nozzle diameter, but also possible a high speed air bleed diameter change if the high rpm air fuel ratio is too rich????


Here is a look at the 500 with the annular nozzles. William