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Holley 780 for a 440? #595736 01/27/10 04:12 PM 01/27/10 04:12 PM
Joined: Jan 2004 Posts: 910 Southern Oregon T toyotajeep OP super stock
toyotajeep OP super stock T Joined: Jan 2004 Posts: 910 Southern Oregon	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 ) , 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

Re: Holley 780 for a 440? [Re: toyotajeep] #595737 01/27/10 04:24 PM 01/27/10 04:24 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	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.

Re: Holley 780 for a 440? [Re: toyotajeep] #595738 01/27/10 04:25 PM 01/27/10 04:25 PM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
DaytonaTurbo Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	Which model of holley carb is this 780? Do you have the list #? Not familiar with it off hand. A 780cfm would do you alright, however I would have recommended an 850. But if your heads are basically stock and your cam is mild, a 750 or 780 will get the job done just fine.

Re: Holley 780 for a 440? [Re: DaytonaTurbo] #595739 01/27/10 04:30 PM 01/27/10 04:30 PM
Joined: Jan 2004 Posts: 910 Southern Oregon T toyotajeep OP super stock
toyotajeep OP super stock T Joined: Jan 2004 Posts: 910 Southern Oregon	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

Re: Holley 780 for a 440? [Re: toyotajeep] #595740 01/27/10 04:35 PM 01/27/10 04:35 PM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
DaytonaTurbo Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	Maybe someone milled off the choke horn to claim the extra 30cfm? Unless they did make a 780cfm variant of the 3310. But to answer your question, the holley 3310 series is about the most well documented and most tunable carb on the market. It should do well in your application IMO.

Re: Holley 780 for a 440? [Re: toyotajeep] #595741 01/27/10 04:40 PM 01/27/10 04:40 PM
Joined: Aug 2005 Posts: 11,543 chicagoland,usa B buildanother I Live Here
buildanother I Live Here B Joined: Aug 2005 Posts: 11,543 chicagoland,usa	780's used to be everywhere, it will work well on a mild 440, and should have a metering plate on secondaries.

Re: Holley 780 for a 440? [Re: toyotajeep] #595742 01/27/10 04:43 PM 01/27/10 04:43 PM
Joined: Nov 2004 Posts: 1,708 S. Il. U.S.A. 5spdcuda top fuel
5spdcuda top fuel Joined: Nov 2004 Posts: 1,708 S. Il. U.S.A.	The original 3310 was rated at 780 cfm and was used as original equipment on mid '60s big block Corvettes. It came with a secondary metering block instead of the plate used in later versions. I used one in '69-'70 on a modified 383 4-speed in my '63 Sport Fury. I am presently using a 3310-6 on my 'Cuda. It's an excellent design & easy to work on and modify. A little small for a really healthy big cube motor, but it should be fine for your application. I suggest that you invest in two & possibly three options. Electric choke, quick change kit for the vacuum secondarys and a secondary metering block kit in case it comes with a sec. plate.

Re: Holley 780 for a 440? [Re: 5spdcuda] #595743 01/27/10 05:30 PM 01/27/10 05:30 PM
Joined: Apr 2008 Posts: 1,285 Pacific NW USA CompSyn pro stock
CompSyn pro stock Joined: Apr 2008 Posts: 1,285 Pacific NW USA	Correct, I'm to understand the original 780 vacuum secondary came as standard equipment on the 375hp 396 Chevy. Shortly thereafter, it appeared as Holley aftermarket part number 3310-1. Subsequent 3310 models dash - 2, 3, 4, etc were rated at 750cfm. As already stated the 3310-1 came with a secondary metering block rather than metering plate. It also came with down-leg boosters. I have the aftermarket 3310-1 so bolting on the Holley TF kickdown bracket was not an issue.

Re: Holley 780 for a 440? [Re: CompSyn] #595744 01/27/10 08:54 PM 01/27/10 08:54 PM
Joined: Jan 2003 Posts: 1,804 McGregor,Iowa 52157 5 500ciDuster top fuel
500ciDuster top fuel 5 Joined: Jan 2003 Posts: 1,804 McGregor,Iowa 52157	I've had 3 780's and I really liked the way they idled,started & ran out

Re: Holley 780 for a 440? [Re: CompSyn] #595745 01/27/10 09:27 PM 01/27/10 09:27 PM
Joined: Nov 2004 Posts: 1,708 S. Il. U.S.A. 5spdcuda top fuel
5spdcuda top fuel Joined: Nov 2004 Posts: 1,708 S. Il. U.S.A.	When you look in Jegs,Summit, etc. they are usually described as 750 cfm vac. sec. Universal carbs. I think the "universal" part really sums it up nicely. With the vac.sec. you can use them on fairly small engines and still not overcarburate too badly and when used on bigger engines they still don't give up too much so long as the build is fairly mild. Out of the box they tend to be a little rich, but that also helps keep the idle fairly smooth as well. Engines with aggressive cams will often need to have holes drilled in the primary throttle blades in order to keep from uncovering too much of the transfer slots.

Re: Holley 780 for a 440? [Re: 5spdcuda] #595746 01/27/10 09:31 PM 01/27/10 09:31 PM
A Anonymous Unregistered
Anonymous Unregistered A	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. 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.

Re: Holley 780 for a 440? #595747 01/27/10 11:51 PM 01/27/10 11:51 PM
Joined: Jan 2004 Posts: 910 Southern Oregon T toyotajeep OP super stock
toyotajeep OP super stock T Joined: Jan 2004 Posts: 910 Southern Oregon	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

Re: Holley 780 for a 440? [Re: toyotajeep] #595748 01/28/10 01:46 AM 01/28/10 01:46 AM
Joined: Jan 2003 Posts: 3,031 Erda, UT 67Charger master
67Charger master Joined: Jan 2003 Posts: 3,031 Erda, UT	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

Re: Holley 780 for a 440? [Re: 67Charger] #595749 01/28/10 02:12 AM 01/28/10 02:12 AM
Joined: Jun 2004 Posts: 3,319 Chicago Burbs sthemi master
sthemi master Joined: Jun 2004 Posts: 3,319 Chicago Burbs	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. Video Little Red Wagon Indy Nats,BurnoutContest

Re: Holley 780 for a 440? [Re: sthemi] #595750 01/28/10 02:21 PM 01/28/10 02:21 PM
A Anonymous Unregistered
Anonymous Unregistered A	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?!? I've gotten 14+ mpg out of a 3.23 geared 3600 lbs. car with a decent cam driving 70 mph on the highway. I didn't think that was so bad!?

Re: Holley 780 for a 440? #595751 01/29/10 03:09 AM 01/29/10 03:09 AM
Joined: Jun 2004 Posts: 3,319 Chicago Burbs sthemi master
sthemi master Joined: Jun 2004 Posts: 3,319 Chicago Burbs	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?!? I've gotten 14+ mpg out of a 3.23 geared 3600 lbs. car with a decent cam driving 70 mph on the highway. 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.. Video Little Red Wagon Indy Nats,BurnoutContest

Re: Holley 780 for a 440? [Re: sthemi] #595752 01/29/10 09:20 AM 01/29/10 09:20 AM
Joined: Jun 2007 Posts: 1,161 Mississippi M Mr. T super stock
Mr. T super stock M Joined: Jun 2007 Posts: 1,161 Mississippi	I used a 780 and a Torker manifold for about 7 years on a 69 GTX. A good combination, that gave no problems at all, and averaged 14-15 M.P.G. on the highway with 3.23 rear gear and a 727.

Re: Holley 780 for a 440? [Re: Mr. T] #595753 01/29/10 11:14 AM 01/29/10 11:14 AM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	I would use the Holley. Once I dailed in the carb on my 63 and my sons Dart I have never had to change the settings other then some jet changes when we went to the track looking for best performance. I dont care as much for the Eddy carbs myself but they are ok and you have alot of adjustment to work with being a metering rod carb. My holleys never leak either. And the new blue gaskets really work good. We run a 750 DP on my sons 400 and a 850 DP on my 440. Both mild builds that have had Holleys on them along time. In fact the 750 has been on my boys Dart since 1997. The 850 on my 63 since it was put on the road in 2006. Ron

Re: Holley 780 for a 440? [Re: 383man] #595754 01/29/10 04:11 PM 01/29/10 04:11 PM
A Anonymous Unregistered
Anonymous Unregistered A	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!

Re: Holley 780 for a 440? [Re: toyotajeep] #595755 01/29/10 04:20 PM 01/29/10 04:20 PM
Joined: Oct 2006 Posts: 3,054 USA B b54406barrel master
b54406barrel master B Joined: Oct 2006 Posts: 3,054 USA	The early 780's were a great carb. I had the L-78 camaro in the 11's with the original 780 on it and I tuned some z-28's that ran low 12's easy with the same carb. It was very 'flexible'.

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