Holley 780 for a 440?
#595736
01/27/10 04:12 PM
01/27/10 04:12 PM
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Joined: Jan 2004
Posts: 910 Southern Oregon
toyotajeep
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OP
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Hello, I have come across a Holley 780 for reasonable. I am looking at something fairly easy to tune for my application. I would like to tune it for daily operation (some mileage ![](/ubbthreads/images/graemlins/crazy.gif) ) , and also for the track. Low compression 440, SD intake, head work, 4.10's and headers in an A body. Street with a few passes down the track. Are these carbs good to upgrade / work with in a performance app? The price is good, but I don't need something that I can't use. Thanks, ROB
1989 Dodge Cummins & 1989 Dodge W-250
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Re: Holley 780 for a 440?
[Re: toyotajeep]
#595737
01/27/10 04:24 PM
01/27/10 04:24 PM
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Joined: Mar 2008
Posts: 5,746 Ontario, Canada
Dodgem
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Whats the carb number more likely it's a 750 vac than a 780 (chevy?) but the same carb for all intensive purposes. Make a great carb for you application depending on the cam 6.5 power valve abd 72 jets in front. back is usually a metering plate but may be a metering block with jets?? then 80's with PV blocked usually has no PV.
Rebuild with new rubber diaphram in the vacuum actuator or what ever it is called and be mindful of the vacuum housing to carb main body seal.
You can run 70 jets front!
Last edited by Dodgem; 01/27/10 04:26 PM.
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Re: Holley 780 for a 440?
[Re: DaytonaTurbo]
#595739
01/27/10 04:30 PM
01/27/10 04:30 PM
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Joined: Jan 2004
Posts: 910 Southern Oregon
toyotajeep
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I am talking to the guy via email and he says it is a 3310 780............Last time I checked that was a 750. The pics look the same.
ROB
1989 Dodge Cummins & 1989 Dodge W-250
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Re: Holley 780 for a 440?
[Re: 5spdcuda]
#595746
01/27/10 09:31 PM
01/27/10 09:31 PM
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Anonymous
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Anonymous
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Buy the throttle extension lever 20-7 for Chrysler applications and bolt it on! They work great for mild, street driven 440's. That's what I always use on mine. ![](/ubbthreads/images/graemlins/thumbs.gif) Depending on cam/combo I start out with either 70 or 72 jets on the primary side (IIRC they come with 72's?) and intall the lightest possible secondary spring.
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Re: Holley 780 for a 440?
#595747
01/27/10 11:51 PM
01/27/10 11:51 PM
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Joined: Jan 2004
Posts: 910 Southern Oregon
toyotajeep
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I am getting the 750 in the morning it looks like. Trading a 750 Eddy for it, so I hope you're all correct.
I do know from my reading that I have never heard a Mopar guy like a 1407 Eddy. Me too after driving it.....
More questions to come in the future I am sure.
Thank you for your help.
ROB
1989 Dodge Cummins & 1989 Dodge W-250
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Re: Holley 780 for a 440?
[Re: toyotajeep]
#595748
01/28/10 01:46 AM
01/28/10 01:46 AM
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Joined: Jan 2003
Posts: 3,031 Erda, UT
67Charger
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I ran a 3310-1 780 for quite a while. Good carb for a milder 440.
11.33 @ 118.46 on motor 10.75 @ 125.35 w/ a little spray Now, high Speed Open Road Racing - Silver State Classic Challenge, Nevada Open Road Challenge, Big Bend Open Road Race Rocky Mountain Race Week 2020, 2022 2.0, Sick Week 2023
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Re: Holley 780 for a 440?
[Re: 67Charger]
#595749
01/28/10 02:12 AM
01/28/10 02:12 AM
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Joined: Jun 2004
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sthemi
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it will work fine, good all around carb, easily tuneable, but generally, for daily driver use the Eddy is the choice.. The Holley will require periodic adjusmtment and the mileage is not real attractive. Be sure to use a high quality fuel filter in line. ![](/ubbthreads/images/graemlins/stirthepot.gif)
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Re: Holley 780 for a 440?
[Re: sthemi]
#595750
01/28/10 02:21 PM
01/28/10 02:21 PM
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Anonymous
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Anonymous
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Quote:
it will work fine, good all around carb, easily tuneable, but generally, for daily driver use the Eddy is the choice.. The Holley will require periodic adjusmtment and the mileage is not real attractive.
Why, once you got it dialed in, would it require periodic adustment?!? ![](/ubbthreads/images/graemlins/shruggy.gif)
I've gotten 14+ mpg out of a 3.23 geared 3600 lbs. car with a decent cam driving 70 mph on the highway. ![](/ubbthreads/images/graemlins/thumbs.gif)
I didn't think that was so bad!? ![](/ubbthreads/images/graemlins/shruggy.gif)
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Re: Holley 780 for a 440?
#595751
01/29/10 03:09 AM
01/29/10 03:09 AM
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Joined: Jun 2004
Posts: 3,319 Chicago Burbs
sthemi
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Quote:
Quote:
it will work fine, good all around carb, easily tuneable, but generally, for daily driver use the Eddy is the choice.. The Holley will require periodic adjusmtment and the mileage is not real attractive.
Why, once you got it dialed in, would it require periodic adustment?!? ![](/ubbthreads/images/graemlins/shruggy.gif)
I've gotten 14+ mpg out of a 3.23 geared 3600 lbs. car with a decent cam driving 70 mph on the highway. ![](/ubbthreads/images/graemlins/thumbs.gif)
I didn't think that was so bad!?
Without starting a war with the Holley crowd, a low compression 440 with a 750 and 323 gears getting 14mpg is excellent. The design of the Holley with the power valve that blows at the worst time and the gaskets that are constantly submerged and must seal fuel are a couple of reasons that you will be fussing with it instead of driving.. And the easy tuneability means that when the weather changes or the fuel is blended differently for weather conditions, you will be trying to make changes to get that kick back.. But by far the biggest thing is dirt in the carb will foul up a Holley in a instant...No carb is immune from dirty fuel but the Holleys are very picky.. Just my opinion.. ![](/ubbthreads/images/graemlins/Twocents.gif)
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Re: Holley 780 for a 440?
[Re: 383man]
#595754
01/29/10 04:11 PM
01/29/10 04:11 PM
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Anonymous
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Anonymous
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Quote:
And the new blue gaskets really work good.
That's all I use anymore.
The only ones that ever leaked on me were used up junk that I bought second hand. Usually some ham-fisted buffoon had scraped the gaskets off with a screwdriver!
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Re: Holley 780 for a 440?
[Re: Lefty]
#595757
01/29/10 07:10 PM
01/29/10 07:10 PM
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Joined: Jan 2003
Posts: 14,610 Not2farfromNashville, TN
Rug_Trucker
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I Live Here
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Install the anti backfire conversion kit in it if it doesn't have it added. I remember a friend that ran a 780 on a 289. Good MPG until he swapped the 271HP cam for a General Kinetics .5++ lift cam, and modded it to be straight 4bbl manual. ![](/ubbthreads/images/graemlins/drive.gif)
"The only thing to do for triumph of evil is for good men to do nothing"
"NUNQUAM NON PARATUS!"
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Re: Holley 780 for a 440?
[Re: Rug_Trucker]
#595758
01/31/10 01:25 AM
01/31/10 01:25 AM
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Joined: Jan 2004
Posts: 910 Southern Oregon
toyotajeep
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It turned out to be a 3310-2 so it isn't a 780. I did find about 3 books in my library that are fairly recent. Two were Holley only so I will be looking into it.
My whole fuel system is kinda messed up and I will likely be working on that too.
I'd like to get this on the road and running decently so motivation is high......
ROB
1989 Dodge Cummins & 1989 Dodge W-250
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Re: Holley 780 for a 440?
[Re: B5 Bee]
#595761
01/31/10 03:44 AM
01/31/10 03:44 AM
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Joined: Jan 2003
Posts: 931
dulcich
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Quote:
It doesn't matter if it's a 780cfm/#3310 or 750cfm/#3310-2, it will flow the same. Both have the same throttle and venturi sizes, which are also shared with the 800cfm/#4780.
I used a #3310-2 on an iron head 440 Duster I had in the '90s, ran a best of 10.30 shifting at 6000rpm.
Yeah, but the 780 has the better downleg boosters vs the straight boosters in the later 750 3310's. I always figured this is where the 30 cfm went. -dulcich
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