What are the differences between these Holley carbs and how can I visually tell the difference? I have a 600 Holley on my car right now, but want to get a 750 double-pumper to rebuild from a junkyard for when i do my head and cam swap next summer. Which would be the best for me to get and what vehicles can I pull one off of?

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82 Camaro:
350
Erson cam, ported heads,Comp Cams 1.6:1 rocker arms
Edelbrock Performer RPM intake, Holley 600
Crane Hi-6 ignition, Accel supercoil
TH350 tranny with 2500 stall.
Eibach Pro Kit
SLP 1 3/4" headers

 

Both the 3310 and 4160 are the vacuum secondary carbs. They can be identified by the vacuum housing on the side of carb. These carbs use metering plates on the secondarys instead of jets, and have no accelerator pumps on the secondary side. The 4150 is the double pumper which uses jets in the primary and secondary sides of the carb which can be changed to tune the carb. It also uses accelerator pumps on the primary and seconday side. With a vacuum secondary carb you can get away with over carbing the engine because it works off vaccum to open the secondary side of the carb, on a double pumper your foot opens the secondaries so you have to be a bit more careful when choosing one. A vaccum secondary carb also works best with high gears,heavy cars, and automatic transmissions. As for tuning, a vacuum secondary is much easier to tune than a double pumper. It's really up to you to decided which one you want. I lean towards the double pumper myself. Just make sure you don't get a carb thats to big for your engine combo or you will hate it I garantee.

 

You have two types of numbers confused. First there are "model" numbers, which tell grossly what sort of carb it is; 4150 = man sec DP sq flange, 4160 = vac sec SP sq flange. Dbl pumps only come with man sec. 3310 is a list #, which is a specific instance of a model 4160. List #s indicate a carb with particular jets, linkage, choke, etc. for some sort of application. 3310 is a divorced choke GM linkage application, first used on mid-60s 327s and 427s from the factory. That same carb ended up on 302, 327, 350, 396, and 427 motors from about 65 to 70. Your 600 is most likely a list # 1850, which is a model 4160 with universal linkage and no choke, and a metering plate instead of a block.

There have been very, very few vehicles ever built that came with a double-pumper (manual secondaries) from the factory, in fact I can't think of a single one off the top of my head. To try to find a carb like that in the junkyard is a pipe dream. I don't even think a 426 Hemi came with a manual secondaries carb; they had a very similar one to a 3310 IIRC.

The best thing for you to do is to get a new carb if you want a DP. Either the 750 of the "Avenger" series (I can't remember their list #s), or a 4779 or whichever of that series is the 750.

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"So many Mustangs, so little time..."
ICON Motorsports

 

I want to bring this thread back. I was given to me a holley list 3310 1 other numbers are 1675 what is this number? It is a 4150 780 cfm with removable jets front and rear (according to my books). It is in rough shape and I am looking to put it back to as delivered new condition.

Question why does this carb have float bowls front and rear with accelerator pumps? My guess is someone slapped on a fuel bowl from another carb and mixed up some parts. Correct me if I am wrong but this vacuum secondary carb does not have two functioning accelerator pumps. As the linkages for the rear accelerator pump are not their and I cant see where they would go.
thanks alot.

 

A 3310 is a good street carb. Mines also a 3310-1. The number after the dash is the 'version' number... so a 3310-3 for example, would be the 3rd revision or redesign for the 3310 model.

The 3310-1 is actually a 4150 carb, because its got a metering block (removeable jets) on the secondaries. The 3310-2 through 6 are 4160 style, because they use a metering plate for the secondaries (non-removeable jets).

The 3310 is a vacuum seondary carb though, not a double pumper, so it has only one accelerator pump, which is on the front, on the bottom of the fuel bowl. It also will not have any linkage to the secondaries, because they open when a certain amount of air is flowing through the primaries automatically. They are not mechanically yanked open like a double pumper.

Only a double pumper has two accelerator pumps (hence the name) and only a double pumper has mechanical seondaries. You have a vacuum secondary 750cfm. No mechanical linkage to the secondaries, no rear accelerator pump.

 

so someone like I said stuck the wrong fuel bowl on the secondary side of this carb because their is a pump their.

 

Then its a fuel bowl off of a double pumper. The 4150/4160 fuel bowls are interchangeable.

 

o.k. thanks I'll probably get the right one then.
Should there be some type of return linkage from the primaries attatched to the secondary's assuring closing of the secondary's when the primarys close? because i am missing this linkage. meaning if the spring in the secondary's were to fail how would they remained closed.

 

Far as I know, the only return spring for the secondaries is on the secondary throttle shaft, on the drivers side. Thats all you need.