What size carb should be on my 440?

[all4rocks]

Chryco, so what do you suggest? how would a mechanical one work on my car?

[Strawdawg]

Chryco is correct.  I thought I had seen somewhere that they, or QF, had introduced one, but this seems to be as close as possible

http://www.quickfueltechnology.com/carburetors-ss-series/street-carburetor-780-cfm-vs.html

[all4rocks]

I looked at that one from QFT. Holley also makes one in a 850 and 870. NOW I AM REALLY CONFUSED!

[Chlngrcrzy]

I am needing to buy a carb for my 440 also, i will have to keep tabs on this post. I want a simple, easy to adjust for a moderate warmed over 440. My engine builder told me i would need at least an 850 cfm. i know nothing about it and  really dont want to have to mess around with multiple carburetor adjustments or jetting.

[all4rocks]

ok, so who has suggestions for a carb? We know that most agree to the 850 CFM, but what brand and model? Are some better than others?

[Chryco Psycho]

QFT & Proform are the same company

[Strawdawg]

I don't think the Holley 850 is the new style with screw in air bleeds, etc.  Therefore I would stick with the QF 780 which I think is a more tunable carb.

[4 speed fish]

The holley street avenger 870 is a very good street carb for the price.380 dollars free shipping on ebay,almost plug and play with very little tuning.Vacuum secondaries with electric choke great for street.

[all4rocks]

Thanks for all the advice. This is very helpful. So would the 780 or a 870 be better?

[Strawdawg]

On a stock engine, I don't think there will be any difference.

I swear I looked at that Holley while ago and it was not vacuum, but it certainly is! 

The Holley is not as tunable but I am pretty sure you are not going to be wanting/needing to do much to it anyway so, if it is considerably cheaper, it looks like a good deal to me.  The vacuum secondaries will keep it from being a "too big" carb and vacuum secondaries will give better gas mileage on a car that actually gets driven a few miles or so every month.

[EB3-GranCoupe]

I bought my Carter AVS (850cfm) from these guys:

http://www.allamericancarburetor.com/

I have been extremely happy with it.

[Strawdawg]

Realistically, I doubt you will find any performance gain with a carb swap at this time.  You have ordered a Street Dominator which will save you some weight if the car currently have a cast iron intake on the car, but, it needs more rpm than the stock cam provides to be an asset which, coincidentally, is what it will take to get any benefit from a larger carb.

I would rebuild the existing carb, buy a bit larger cam to extend the powerband a bit, and then follow up later with a better carb.  In other words, it takes a combination of parts to work and you are missing a key component (better cam) to work with what you have done so far. 

[Chryco Psycho]

I would grab a carb with removable bleeds , QFT or Proform , the double pump will work great you just have to learn to drive it , you cannot simply floor it off idle , you need ot learn to 1/2 step it until maybe 2000-2500 rpm then floor it

[all4rocks]

What cam would help the 850 carb and new intake function better? I already have hooker competition headers.

[Strawdawg]

Chryco has often suggested the Lunati 303 and maybe the 302.  I installed the 303 and I think it is a great street cam with a higher stall torque converter.  I used a 2500 rpm from PTC.  I think the stock converter might be a bit tight but I did not try it.  The 302 might be a better with a stock converter and will still make some higher rpm power.  I think Chryco would be the ultimate authority on that decision.

I am with him on buying a modern carb with changeable air bleeds.  I prefer the vacuum secondaries on the street with a higher geared rear end but I don't disagree that you can learn to drive a double pumper by doing as he suggested.  The gas mileage will be lower and it may take a bit more tweaking to dial it in for better mileage than it gives out of the box.  But, let's face it.  Unless you are driving 200 miles on the week end, who really cares if you get 10 mph or 12? 

I like the QF options or the Proform versions.  Both have Proform parts in them.  Buy the one that gives you the best price.

It is really hard to make decisions when you are getting 20 opinions online   I would pm Chryco and follow his suggestions.  I'm pretty sure he has 100 times the experience of most of the rest us!