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new member, looking for advice on carb choice for 440 motor

N

nervus rt

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I have a 69 charger rt with a 440. 509 cam, headers, slight head work, 906 heads, M-1 manifold, roller rocker lifters, 3:73 gears, tremec 5 sped. Currently the car has a edelbrock 750. Not happy with it. Is it the right size for the motor? seems to run very rich. Any advice on carb size and brands would be very much appreciated.
 
Your 750 May be too small. Many opinions on this..

I'm running holley 850 double pumper with air horn removed on 383, same heads lighter cam though. I've tried holley...650 double pumper, 750 3310, and this 850. By far the 850 goes the best..

See if you can find different ones to try before you buy if possible. Save you a ton of cash.

Good luck!

Oh, I almost forgot, welcome aboard!
 
I'm not familiar with the details of tuning the Edelbrock carbs, but if it's rich it needs tuning, same all the others. You are much better off with a carb a little on the small side. Tend to be more responsive & you don't sacrifice much power.
 
Welcome ,sounds like you just need to tune it , the carb if anything would be to small ,I think the stock carb was 840cfm (correct me if I'm wrong guys) I like edl. Carbs. For the street , and Holleys for raceing , I've had more problems out of a Holley as a d.d. carb the eld. Is set it and forget it in my oppn.
Good luck let us know what you decide .
 
nervus rt said:
I have a 69 charger rt with a 440. 509 cam, headers, slight head work, 906 heads, M-1 manifold, roller rocker lifters, 3:73 gears, tremec 5 sped. Currently the car has a edelbrock 750. Not happy with it. Is it the right size for the motor? seems to run very rich. Any advice on carb size and brands would be very much appreciated.
Click to expand...
the 750 and 800 edelbrocks are calibrated too rich. take the .107 secondary jets out and put them in the primaries. put some .100's in the secondary. the orange step-up springs may be too heavy for that cam. try some yellow springs. this ought to get you in the ball park.
 
nervus rt said:
I have a 69 charger rt with a 440. 509 cam, headers, slight head work, 906 heads, M-1 manifold, roller rocker lifters, 3:73 gears, tremec 5 sped. Currently the car has a edelbrock 750. Not happy with it. Is it the right size for the motor? seems to run very rich. Any advice on carb size and brands would be very much appreciated.
Click to expand...

I have a Holley 3310 750cfm and have plenty of power and mileage is not that bad either.

I suggest you get a carb kit, and then tune it. If that is not up you alley seek out a quality mechanic in your area, one that hits the drags on weekend would be optimal.

I have the same gear as you with a 4 speed and a .545 lift cam with and Edelbrock top end kit
 
Welcome. My 2 cents. When I drage race my 71 cuda with 440, and similar to your set up--I am a horse apeice in ET and MPH between a 750 DP and an 860 DP. Engine builder and drag racer Chuck Lofgren always got better times running a 750 dp vs an 850dp. The edelbrocks and Carters usually are a tick slower, and I agree -they come too rich as received in jetting. Take your 750 Edelbrock and start by taking 2 jet sizes down on both primary and secondary, and retest. I have used that carb as well for drag racing.
 
My advice would be to tune the Eddie before thinking about another carb, once tuned it may make you happy. What I did was read up on carb tuning (a Carter specific book would be a good starting point) and learned what does what and dug in. I personally don't like Eddies and would go for any Holley type (Demon, Quick Fuel, etc) if the Eddie doesn't work out for the better tunability and being less prone to vapor locking. As for sizing, it's a toss up but if you don't do allot of high rpm pulls then the 850 isn't needed. Hope it works out for you.
 
747mopar said:
My advice would be to tune the Eddie before thinking about another carb, once tuned it may make you happy. What I did was read up on carb tuning (a Carter specific book would be a good starting point) and learned what does what and dug in. I personally don't like Eddies and would go for any Holley type (Demon, Quick Fuel, etc) if the Eddie doesn't work out for the better tunability and being less prone to vapor locking. As for sizing, it's a toss up but if you don't do allot of high rpm pulls then the 850 isn't needed. Hope it works out for you.
Click to expand...

I concur, rejet and tune first. Those are good carbs, and much better gas mileage on the street. You won't notice anything different. Heck, I was able to get 11.89 on my 440 in the somewhat stock class-running a 71 AVS...Jets are primary area--and then the metering rods
 
Nervus RT. First and foremost, Welcome to the site. Everyone is here extremely helpful.

Have you pull this carb apart any or is it out of the box ? Do you have an a/f ratio gauge?

If it's out of the box, a eddy 750 will not run correctly period. You need to purchase a tuning kit for your carb before you give up.. Also you need to confirm that you have no more than 4.5 (some say less) PSI of fuel pressure. Edelbrocks HATE anymore than that. Another thing to check is the floats, sometimes they will be off from the factory.

I will say 750 are notorious for a off-idle stumble. Some people say it can be fixed with a bigger squirter, but the small idle feed ristrictor also stems some of the problems.

I would solicit advice from Lewtot184. He has multiple application using carters on high performance motors.

Do you know if it's rich? Because i though the same, but my edelbrock was lean.. The exhaust burns the eyes!

With an edelbrock it usually a combination of primaries are too big and the metering rods are stuck in the WOT position because the step up springs are too strong and the throttle blades are open too far exposing the transfer slot.

The video below has been helpful for me, to get a baseline and also to give you an idea of what it metering rods are supposed to look like if properly performing.

If you have exhausted all of these situations and don't want to fuss with edelbrock than so be it..

[video=youtube;BXmMyFhB6mY]https://www.youtube.com/watch?v=BXmMyFhB6mY#t=144[/video]
 
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