Carb

[Cecil14]

Which carb should I used guys? I've heard a lot of people are using quadrajets. How many cfms are q-jets? I don't really need anything huge for the 360, gotta be a 4 bbl though.

Thanks for suggestions,
Anthony

[Crazy_Jeepman]

I like my edelbrock 1406 on the Performer intake does real well in my J10. When I come down I will give you a ride that will change your outlook on life!!!!! :D :D :D

[jeepbob]

Of course, to give equal time, I will let you try the Holley 4160 on my CJ. Just hang on tight as it torque steers like a mother.
Q/jets are usually 750 cfm.

[Cecil14]

Wow, q-jets are 750? Guess I always assumed they were only like 650. Hmm, may have to look into one, what can I rob one off of? There's a tiny little junkyard here that's probably got something with a q-jet on it. Also how will I be able to tell if that's what it is?

Wouldn't mind looking toward a holley or an edelbrock either, but price is going to be a big factor right now. The 360 is hopefully just going to be a stock temporary thing until I can find and build either a 390 or a 401. Will get some bigger stuff then. ;)

One more thing, any of these carbs spread bores? I wouldn't mind having something like that for gas milage, not that I'm going to get any anyways.

Thanks,
Anthony

[jeepbob]

The q/jet is a spread bore but you will need an adapter plate to put it on a stock AMC manifold as the AMC manifold has a square bore bolt pattern. Rebuildable Holleys can be had for $25 at swap meets and the genuine Holley rebuild kits are between $30 & $50 depending on the kit you get. If you buy a used one, make sure it is all there and that it has adjustable needle and seat and is a single feed with side hung floats. If you go the used Holley route, buy a How to Tune Holleys book to get to know what you are buying. Also the Holley web site has a chart with the ID numbers and what the cfm and original jet sizes are (among other things).

[Cecil14]

Thanks bob. Is the q-jet made by holley? I'm probably going to be putting my foot in my mouth here but I'd kinda rather stay away from holleys, my J-10 had one on it when I've got it and it was the worst POS I've ever seen. When I went to get a rebuild kit for it they wanted well over $100 for it.

Cool on the spread bore thing. Yes, I will definently need to get a book on tuning carbs, whichever route I decide to go. Preferably I whould get something that gives a bit of info on each kind of carb, and carbs in general, but I'll look into that later.

Thanks,
Anthony

[Crazy_Jeepman]

I am not completely sure on the history of the Rochester Quadra-Jet. I believe they were made by Webber, then Edelbrock started making them, or bought out Webber I am not sure there. I think Q-Jets are rated different CFM's as anything else like there is a difference between the ones used on BBC and SBC, I would imagine them available from at least 600 CFM to 750 CFM at the very least of selection. I personally think 750 is to much I just pulled a Holly off my J10 thinking it was to much carb put my Edelbrock 1406 on instant world of Difference. Its OK Anthony I am not a big fan of Holley, mainly because I have never had anything to do with them. ;)

[Rogue]

a q-jet could be had in a 800 cfm model but are extremely rare as they only came on big block SS cars. the q-jet is an excellent choice for gas mileage AND performance as the primary bores are small in diameter for every day light throttle drving and watch out when a properly tuned q-jet opens up its huge secondary bores. i bought a book several years ago called how to tune and modify carburetor performance written by forbes aird and malcolm elston which i found quite useful over the years. according to them general motors owned and made the carbs and these were the only two sizes availible and was first availible in 1965. you might also look for a carter AVS carb off of 70's Mopars as it is an excellent performer and will bolt right up

[jeepbob]

The Rochester Q/jet was made by the Rochester Div of GM. The Carter q/jet was made by license from GM by Carter. Webber bought the bankrupt Carter Co. and I believe that Edelbrock either bought the tooling from Webber or Webber makes the AFB's and Q/jets for them.
The q/jet, while being a dependable carb is a tuning nightmare and are hard to get parts like jets and rods for as the always have to be ordered. While I am putting one on my motorhome, I would never use one on my Jeep as I just don't like them. I perfer the tunabilty of the Holley. As for dependabilty once the Holley is tuned right you don't have to mess with it. The biggest problem with a Holley is that too many people that think they know what they are doing screw with them and really mess them up.
BTW I will be more than happy to take any Holley's that people are unhappy with as I always have a use for them and even a top of the line Holley trick kit (rebuild and hop up kit)is less than $50.

[ December 30, 2001: Message edited by: jeepbob ]

[Balming]

I have a big holley 4barrel double feed carb. It's used with some rust on the butterflies, but I can hear it "pump" when I work the lever. don't know what size it is. I would trade it for 2 of the chrome center pieces that go on the front wheels of my 78 cherokee chief.