best size carb on a 440?

[Cranky]

Well, to be fair, we're still waiting for the O.P. to chime in with his decision after getting opinions.

Been over 8 years since the OP has been here.....I think he's left the building.

 

[RemCharger]

With a 3500 stall and 800 cfm carb it would have been a second faster.

That would be good returns on your dollah

 

[6PKRTSE]

I have run everything from 600, 650, 750 and even 850 carbs on stock to mild big blocks. Big blocks do like cfm. Currently have a 750 Edelbrock on my New Yorker, an 850 DP on my built 383 Roached Runner, Fast EFI 2.0 on 440 in Charger #2, 1350 cfm on Charger #1 (it's a Sixpack) and 2 1050 Dominators on my 528 Hemi. All street driven.

 

[Cojohnso1]

I run a Holley 750 on mild 440 build. The carb is older manual choke. The older edelbrock dual plane edelbrock performer doesn't have a vacuum port. Thus just kept manual. Runs very we for overall street performance. Car is 4-speed with Dana 3.54:1 Rear. The car is running 28" taller tire on 15" rally rims. Thus makes it not quite as quick on low end than my first '69 GTX of very simular build and gear. But that car had wider 50s 26.5" tall rear tire. Thus totally expected. But the taller tire car is better performing on the top end. Making her a bit of a highway commando. (For lack of a better term. Lol.) It buried the 150 speedometer while GPS confirming 142.8 MPH. (So close enough for a stock 50+ year old speedometer.) Stock tach showing just short of 6k. (Which math suggests also close enough for a stock 50+ year old tach.) Thus very happy with the performance. And expected at that high of RPM? The hydraulic purple grind mild cam with mild ported 915 heads were making some valve float sound and feel. Thus was a good time to back her down. Lol. (Let alone concerns about Cooper Cobra tire performance.) But they held decent too.)

So in closing. The Holley 750 single pumper performs well. There are of course quicker throttle responding options than the 750. But I have to give a thumbs up at overall performance.

Just my experience.

 

[Cojohnso1]

Also. It appears to me there is a correlation between carb/intake and head flow? And the appears to be 3:1. (At a minimum.) Meaning if your heads bench flow let's say 380 CFMs on the intake side? X3+ is needed on carb/intake. Thus about 1050 cfm carb is required at a minimum. Being that 440 iron heads flow around the 220-250 range? 750 should do?

I'm sure this ratio is not static to all builds. But would surprise me if not close. Or at least the beginning of a thought process?

I would be interested in others thoughts?

 

[BSB67]

1350 cfm on Charger #1 (it's a Sixpack)

Technically, 955 cfm.

 

[Cranky]

I always had several carburetors in the cabinet and I would just keep trying bigger and bigger until the car didn't speed up anymore. Used to have Holley DP's from 650 to 850. My old 10.60 car had two 750's on top of a tunnel ram and it loved them. People told me I had too much but I wasn't there for the fuel mileage....