holley model?

[chargerman67]

How do you tell which model holley I have. I have been told it is a 750 DP but I need to know which model. It is leaking a lot of gas and I am trying to decide if I should buy a rebuilt kid or purchase a new carb. Any insight, thoughts, or suggestions would be greatly appreciated. 

thanks,

Luther

[Rolling_Thunder]

pretty sure the casting numbers are on the air horn on a holley -  I know very little of them but if it was a 750DP - maybe it is a "3310" model ? 

[Just 6T9 CHGR]

Looks like a vacuum secondary to me....only 1 metering block on the front bowl & has the secondary spring housing.

There is a model # stamped on the face of the air horn (where choke butterfly is)like Alex stated above

[GPULLER]

Yep looks like a vacuum secondary, no squirter on the secondaries so its not a double pumper.  If it was a double pumper it would have a metering block on secondaries and another accelerator pump in the float bowl.   
The list number is on the choke horn.  It will be on the right hand side when looking at the engine.  Should be stamped "LIST 4779-_" with a 1-9 after the 4779, if it is for sure a 750.

Look at the LIST number then check it on this Holley link. 

http://www.holley.com/data/TechService/Technical/Carb%20Numerical%20Listing.pdf
 

[chargerman67]

I'll take a look and let you know.

[chargerman67]

Alright gentlemen, it read "LIST 3310-2" So right on Rolling_Thunder! I posted a pic so you guys can take a look at the other side and let me know what you think. GPULLER I'm not really sure how to interpret that document. I'm thinking it says its a 750 but not sure wether any of those numbers would indicate if its a DP. So have any of you every rebuilt a carb?

Thanks again

[Ghoste]

It's a 750 vacuum secondary single pump.

[chargerman67]

Is that a decent carb? How would you compare it to a double pumper or other carbs out there?

[Ghoste]

It's a great carb. I have one on my 383 but I converted it to a metering block on the secondary side, yours still has the metering plate.  The plate is fine but I tend to booger things up as much as I can so I needed the block for jet changes.
Yes, some are better but others are worse.  It is an excellent carb for 80% of the street driven vehicles out there that want a little tuning capability.

[chargerman67]

not to sound like a ra-tard but what is the benefit to having 2 metering blocks?

[Ghoste]

Ease of customizing things at the dragstrip in my case.  With yours, there is a plate between the bowl and the carb body and calibrated passages in that plate decide teh fuel on the secondary side.  If you look at your primary bowl you'll see a block between it and the body.  The block allows you to screw in different jets (at it's most basic) and fine tune things a bit more.
What is your main use for the car and the rest of your build?

[Rolling_Thunder]

basically to adjust the secondary size of fuel flow you need to replace the plate...    because the plate is factory drilled to a certain size...     if this plate is replaced with a metering block (like the front) then sized jets can be screwed into it and you simply change the jets rather than the whole plate...         

It is good for drag racing because it allows you the ability an almost infinite adjustment of the front and rear fuel flow.

[chargerman67]

A weekend driver mainly. I also want to take it to the track on occasion. I want to eventually get some serious power out of it but a lot of stuff needs to be done. My dad bought the car for us in 1996. Since then my dad passed away and I went to college and the car went downhill. Now I'm out of college (2007) and started back at it. Converted it to discs up front. New radiator. New gas tank. New shocks ect. Its been a real challenge just to make it "safe" but after I iron out all this other stuff (such as a leaking carburetor) I want to really start producing some real power.

[Ghoste]

Then I think for the moment you would be more than satisfied with that carb just as it is. (except for the leaking part of course)

[chargerman67]

I decided to stick with it and just purchased the renewal kit on summit. Thanks for the help men. 

[GPULLER]

Good choice,they're easy to rebuild.  I would suggest going to the auto parts store and buying a gallon of carb cleaner.  The one with the basket for dipping parts.  Pull carb apart and soak for an hour or so, rinse everything with carb cleaner and blow off with compressed air.
You will need a larger container to soak the carb body and base plate.