The Bear's right, it's not a double pumper, not even a 4150, but a 4160 type, and you can clearly see the Ford numbers on the choke horn, appears to be a stock 390 pickup carb- it's even plumbed with the hard line from the fuel pump. If I remember right, they were around 390 cfm, and a pretty good carb- a good cleaning, fresh gaskets & needle/seats, and adjust everything, should be good to go.
A double pumper will have a second pump under the secondary bowl, just like the front one, with a second arm to actuate it below where the vacuum can is on a vacuum secondary carb. Double pumper is another one of those buzz-word things that some folks just think is automatically better- like billet, side-oiler, etc.- in some cases, the vacuum carb is the best way to go- a double pumper is for different conditions, not necessarily better in every case- or in this one

 

I have an edelbrock 1407 750cfm with the manual choke, fresh off a rebuild as a matter of fact. This is my first edelbrock carb and I am more than satisfied with it. BTW manual choke is the only way to go.

 

I have the 1405 (650 cfm ) and it just the right balance of power and mileage. It was a super easy set up, I do have a Holley 4150 HP (Double Pumper) and Its a pain settting up, Took me weeks to get it just right, and Im still not happy with it, It sits on a shely collecting dust.

 

From all the guys that claim they never have to adjust anything on their Edelbrock carb, actually all it is is a prettied up old Carter carb from back in the 1960s, I don't think most of these guys would recognized a properly working carb it it hit them over the head.

 

Well i just thought it was because of the holley instructional video that comes with the new carbs, i swear the same set up is in the video and it says its a double pumper but i must have been mistaken.

But also i just recently bought a holley 750 double pumper with electric choke and vaccuum secondaries for the 423stroker and i was a bit upset with it, it takes a genius to tune them perfect, expecially for my cam which is producing less then 5 for vaccuum at idle, so i just stuck with my 600 edelbrock for now with electric choke and manual secondaries.

 

There is no such animal as a double pumper (with requires mechanical secondaries) with vacuum secondaries. You need to either go to school on Holley carbs or quite guessing or lying.

 

What you probably have is a 3310 Holley? Again, it is not a double pumper if it's a vacuum secondary carb- and don't worry about the "cool" buzz words "double pumper"- it's a different kind of carb, not necessarily better than what you have. If you do have a double pumper, and it's not actually vacuum secondaries, you bought the wrong carb, and it doesn't work right for your application- not the carb's fault. First you need to realize what part of the carb the pump is- on yours, you should have one, on the bottom of the front float bowl, with the arm that moves it when the throttle opens- that's the pump. If it has vacuum secondaries, there will not be one on the rear float bowl- it isn't necessary as the secondaries open automatically with engine demand. The second pump on a mechanical carb is to help eliminate a bog when the secondaries are forced open by Leadfoot Larry and the vacuum goes away- that's all it does, no magic or voodoo. They are meant for applications other than 4x4 trucks- like high RPM stick shift drag cars. Now you know more about Holleys than your buds who go "Ooooh, look, a double pumper"
And it doesn't take a genius to tune one- you just have to remember that you're a beginner, and ask for advice, instead of giving it- like we all did at first. in fact, in many cases, amateur "tuners" make carbs run worse. In your case, with 5 in of vacuum, you probably need a different power valve, probably a 3.5- was it very rich at idle? The stock power valve was probably dumping fuel at idle. You don't need a genius, but you do need the help of someone with a little more experience- please resist the temptation to "dink with it". And a good Holley tuner will probably be able to get that vacuum level up some for you- if you think it runs good now, a sharp tuner will really open your eyes. And for your 4x4, a vacuum carb is the right choice- but if you're actually going to off-road it much, you'll need the side-hung floats like the carb in the picture above- the center hung floats will flood out on steep hills, usually in a very bad spot- not good. If it's gonna be a street cruiser, won't matter

 

This is when a fool shows themselfs. Some of us have very intensive back grounds, My self I am ASE Master Tech. and a Retired Army Motor Pool Chief. Using a Dyno to set a carb for me is a everyday event. In my case. I never got the Holley turned to my standards, It simply never worked how I liked it to. Im not saying its Junk. Just in my case I didnt like how itr ran on my 427.

Yes many confuse the double pumpers with all 4bbl holloys. And in reality, there a poor carb for everyday street driving, For me this was the biggest factor in why I decided to change from the Holloy to the Edelbrock. the 1405 Edelbrock used a Flow driven sec. upper flap, so even if the secs open. the sec DONT activate fully unless there is enought engine vac to pull open the flaps. This is good for most everyday driving when people slam on the gas and the engine simply not ready, it dont fall on it face.
Yes they built the Edelbrock on a old design, BUT sometimes the old design are to good to simply ingore and it works well.

 

I guess some folks also don't realize how old the basic Holley 4V design is, either

 

I know exactly when the 4150 carb came out. I was alive and into cars. But I also know why the 4150 holley was created, because of all the problems with needle carbs. I absolutely hated the pair of the POS Carters on my Hemi. More carb fires than an arsonist could set.

 

Well i dont like to sound like any ol dip on here who doesn't know a thing, i know quite alot and i just give the information i read and this happened to be from the box and the carb i got, but i now realize that when it said double pumper on the side of the box, it wasn't referring to mine so sorry about the mistake. the number of the carb is a 4160.




When it said double pumper, it was just saying what one is, i thought it was meaning my carb was a double pumper, my bad.

 

Just because the box says so, don't make the product inside so. You got screwed sonny boy. That is a single pump, vacuum secondary Holley carb. I also believe that box should have had a DP in it, as Holley does not put single pump carbs in boxes labled "Double Pumper". It's like when you buy from the McDonald's driver thru, ALWAYS check to see that you got the right order and a complete order before you leave the window.

 

4160 is the type of carb, meaning it has one metering block with jets in the front (the piece between the carb body and the float bowl) and a metering plate for the secondaries (notice that the bowl bolts directly to the body). A 4150 type has metering blocks with jets fore & aft. If you look on the front of the choke horn, you should see a stamped number, probably 3310, which is the particular model carb. I don't imagine Holley is having separate boxes printed up, they may be just showing off the old buzz-words "double pumper"- as you can see, they have trademarked it. See what your receipt says, and will also probably be on the box lable, see what you paid for- probably a 3310 or similar. If you told the seller you wanted the carb for a 4x4, and they sold you a high-priced double pumper, that's when you should be pissed- it's not the right carb for what you're doing, and they would have given you bad advice and sold you the wrong part- by the pictures, you have the right part, hopefully you paid the right price. Hopefully you have a 3310, which will match your engine and vehicle nicely- the only thing to be concerned abut, as I said, is if you intend to do any serious hill-climbing with it, those "cathedral" center-pivot float bowls can get you in serious trouble by flooding out- for serious off-roading, you'll need the side-hung float bowls- which can be switched out. If she's gonna stay on the flat ground, then just go drive it, you've got the right carb for your rig- put "double pumper" out of your mind

 

That one with Vac Sec is better for every day street driving, so in the long run, your better off with it and NOT with a Double pumper