what kinda carb should i get.

[clayman440]

I have a 68 Charger, w/ a 440, mostly stock except for the headders, aluminum intake & 509 cam. I currently have some type of Holley 4bbl on there, but no one can figure out what type. it's just some odd ball. it seems to choke up at high RPM's, i'm thinking I need a 750 series Carb, but what kind would you reccomend ?

[Ghoste]

I guess my first thought would be to try and fix what you have but of course, I don't know what you have already tried.  There must be some numbers on it of some kind?
Secondly, if you just want a cheap bolt it on and forget it carb for a mostly stock configuration, you may want to put one of the Eddycarter AFB clones on there.  Some people hate them but for an application where you don't want to monkey with it, it would be my first choice.

[firefighter3931]

You need a carb with an agressive fuel curve....the 509 cam has lots of overlap and can be difficult to tune w/o the right carb. The Holley list # 4779 750 DP would be my choice.


Ron

[Ghoste]

I glossed right by that 509 cam part, and that certainly changes my opinion.  But still, are there any list numbers on the one you currently have?

[Mean 318]

You need a carb with an agressive fuel curve....the 509 cam has lots of overlap and can be difficult to tune w/o the right carb. The Holley list # 4779 750 DP would be my choice.


Ron

750/770 holley!

[Purple440]

What's the difference between the 750 v/c and 770 v/c Avenger?  I looked at the specs but I didn't see any difference except the CFM...

[Ghoste]

Quick change secondary spring kit.  Metering calibrations maybe.

[471_Magnum]

What's the difference between the 750 v/c and 770 v/c Avenger? I looked at the specs but I didn't see any difference except the CFM...

750 is a 4150, with a secondary metering plate (not adjustable). 770 is 4160 with a metering block and jets. In addition, you get the aforementioned quick change springs and the calibration is different.

[firefighter3931]

750 is a 4150, with a secondary metering plate (not adjustable). 770 is 4160 with a metering block and jets. In addition, you get the aforementioned quick change springs and the calibration is different.

Just a point of clarification.....the 750 (3310) and 770 vacuum secondary carbs are both 4160 models.

The 4150 series are double pumpers with 4 corner idle and metering blocks on both the primary and secondary venturies. The higher end 4150's have additional tuning features like adjustable idle/high speed air bleeds and downleg boosters.


Ron

[471_Magnum]

Just a point of clarification.....the 750 (3310) and 770 vacuum secondary carbs are both 4160 models.

The 4150 series are double pumpers with 4 corner idle and metering blocks on both the primary and secondary venturies. The higher end 4150's have additional tuning features like adjustable idle/high speed air bleeds and downleg boosters.

Ron,

Got to disagree with you there.

We're actually both wrong, but I think you're wronger. The model designation does reference the secondary metering circuit. I just had it backwards. 4150s have the metering block, 4160s have the plate.

The model designation does not reference the accelerator pump circuit(s), or the secondary actuation. Generally speaking though, all douple pumpers are 4150s and have a secondary metering block... but not all 4150s are douple pumpers.

Follow me?

The 770 Avenger is a 4150. Part number is 80770 (or 81770 w/elec choke). It shares many components with the "3310" which is a 4160, part number R83310

[firefighter3931]

Just a point of clarification.....the 750 (3310) and 770 vacuum secondary carbs are both 4160 models.

The 4150 series are double pumpers with 4 corner idle and metering blocks on both the primary and secondary venturies. The higher end 4150's have additional tuning features like adjustable idle/high speed air bleeds and downleg boosters.

Ron,

Got to disagree with you there.

We're actually both wrong, but I think you're wronger. The model designation does reference the secondary metering circuit. I just had it backwards. 4150s have the metering block, 4160s have the plate.

The model designation does not reference the accelerator pump circuit(s), or the secondary actuation. Generally speaking though, all douple pumpers are 4150s and have a secondary metering block... but not all 4150s are douple pumpers.

Follow me?

The 770 Avenger is a 4150. Part number is 80770 (or 81770 w/elec choke). It shares many components with the "3310" which is a 4160, part number R83310

Jim, you're right.....we're both wrong and i'm wronger.....

The old 3310 which i'm most familiar with is a 4160 series carb....allways has been that way. The new Avengers do have the secondary metering blocks....which does in fact make it a 4150 style carb. Holley now makes a 4150hp vacuum secondary 750cfm carb with the radiused venturies and adjustable bleeds (pn 80529-1)....that one is the carb i'm more familiar with because it has the features best suited for a performance application.....big cam/lots of overlap/poor vacuum  & signal to the boosters etc...

While the avenger is still a descent carb for most mild applications it wouldn't be my first choice for the original poster's engine. The fuel curve is just too conservative and it will be difficult to "dial in". Your own experiences with the avenger on the 471 stroker would bear that out...


With all that being said.....i still prefer a double pumper carb. 




Ron

[Ghoste]

So, did the grasshopper snatch the pebble or not?

[jg68]

With the .509 cam & headers, my choice would be the 850 vacuum sec., i have a milder 440 then yours, tried just about every carb under the sun (including a TR) , finally ended up with one of those 502 BBC crate 850 vacuum sec., for the first time ever, it'll break the MT Drag Radials loose from a 20 mph roll, i bought a slightly used one off e-bay for less then 1/2 the cost of a new one, this carb sells for 489.00 at Summit/Jegs., i LOVE it!!!

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=018&sspagename=STRK%3AMEWN%3AIT&viewitem=&item=280156213623&rd=1

[ronv]

Well here is my 
I have been running Barry Grant carbs for 4 years now. They are great out of the box. I currently have a 850 Mighty Demon and on my 440 and it really helped the car come to life. I am really pleased with the M1 single plane intake as well. Back to the carb...we changed the air bleeds and picked up 15 rear wheel hp.

Aloha!