aftermarket intake and carb opinion - JeepForum.com
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post #1 of 16 Old 01-31-2013, 05:36 PM Thread Starter
bear991
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aftermarket intake and carb opinion

Hey guys I do mainly Forest Service trail riding since I'm a volunteer for the U.S. F.S. but occasionally I go with my club to some ORV parks. My 78 with a 304 has a two barrel carb and intake. In your opinion if I was to upgrade to a four barrel and aftermarket intake which carb and which intake would you install?

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post #2 of 16 Old 01-31-2013, 06:48 PM
turbonusse2
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i did a edelbrock performer intake and 600 carb. if i was to do it again i would get the edelbrock intake and buy used holley and rebuild it. new carbs are ridiculously expensive imo. if you can find a cheap holley 600 with the side hung floats that would be a good way to go. i was able to get one for 25 complete carb.



My carb does not have a secondary metering block so i am going to get one with the transfer tube that you see in this the truck avenger carb pic. The transfer tube you have to call holley. a jet kit, gaskets, and maybe a couple other small parts which you can order from summit or wherever you buy parts. by the time im done i sould be around 200 complete.

http://www.jpmagazine.com/techarticl...or/viewall.htm

this is a good place to look for what you should do. im doing the same thing that they are here.

live and learn
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post #3 of 16 Old 01-31-2013, 06:50 PM
turbonusse2
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http://www.jpmagazine.com/techarticl...r/viewall.html

sorry this link works

live and learn
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post #4 of 16 Old 01-31-2013, 07:29 PM Thread Starter
bear991
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Thanks Turbo, Good info
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post #5 of 16 Old 01-31-2013, 08:09 PM
82JeepCJ7
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I run an Offenhauser intake and Q-jet carb. Next to fuel injection, there is not a better carb out there for wheeling.

Beat it to fit, paint it to match!

Wheel, Wrench, Repeat.
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post #6 of 16 Old 01-31-2013, 08:19 PM Thread Starter
bear991
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I was wondering if a good ole Q-jet wouldn't do the trick. We've used racing for years...just had to tweak em some
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post #7 of 16 Old 01-31-2013, 08:25 PM
82JeepCJ7
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Once you understand how they work, they are simple carbs that offer great performance offroad. The small primary's are great for off idle throttle response.

Beat it to fit, paint it to match!

Wheel, Wrench, Repeat.
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post #8 of 16 Old 02-01-2013, 06:59 AM
davbytrace
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Edelbrock 2131 intake, with an Edelbrock 1403. Can't go wrong. You will also need the fuel line adapter and the throttle plate adapter, all which are available online.
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post #9 of 16 Old 02-01-2013, 07:54 AM
turbogus
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Many folks seem to have good luck with that Edelbrock 'Carter AFB clone'



and that is what was on 'Black Betty' when I got her. Even after a rebuild/rejet (& rods) using Edelbrocks stats I couldn't get that card to run right. Ultimately after she stalled at a traffic signal a backfire through the card caused a small fire. (Thanks Heavens I had a fire extinguisher aboard). As luck would have it a couple of decades ago I sold my actual Carter AFB to a friend that was going to run it on his SBC project that never got off the ground.



This Carter had been on a 350 SBC with a very lopey cam and other speed goodies so I went with smaller jets and stiffer springs on the metering rods to adjust the metering and 'wha-la' she's been running strong ever since.

The parts shop that stocks part for Skylab II will not have parts for our year/model of Jeep
We cannot accurately judge the trajectory of a speeding critter (cat, dog, sasquatch)
Record heat waves and floods only occur when we visit that area
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post #10 of 16 Old 02-01-2013, 10:29 AM
ASteve
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I am currently in the process of doing what you are asking. Edelbrock 2131 performer intake hands down. As for the carb I decided to go with the Carb Shop and have them build me a custom Off Road Holley. They take all your specs from your current engine and build it to those specs. Then then dyno it on their engine.

It's a stage II build: http://www.customcarbs.com/index.php...es/holleycarbs

Anyways, It's a thought...
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post #11 of 16 Old 02-01-2013, 04:11 PM
Matt1981CJ7
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Steve,

You got that Holley running, yet?

OP, I went with the 2131, and a Q-jet.

Matt
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post #12 of 16 Old 02-02-2013, 04:33 PM
ASteve
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Matt,

Nope, just spent the last couple of hours figuring out how to run my gas line from pump to carb. I think I got it, but need one more small fitting...

OP...Lots of good options here. Let us know what you come up with...

SC
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post #13 of 16 Old 02-04-2013, 12:06 PM
lsukevinc
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i bought a used edelbrock intake and a used holley truck avenger 470. i rebulilt the carb and only have about $300 into the set up and it has made a world of difference. You do not need a 600 CFM carb for a 304. my 470 makes plenty of power and sounds mean.
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post #14 of 16 Old 02-04-2013, 12:16 PM
ASteve
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Just curious as to why you say,
Quote:
Originally Posted by lsukevinc View Post
You do not need a 600 CFM carb for a 304.
SC
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post #15 of 16 Old 02-04-2013, 12:58 PM
lsukevinc
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600 CFM is too much. I believe Jeep Hammer has the formula, but here are a few links to try.

http://www.csgnetwork.com/cfmcalc.html

http://www.gtsparkplugs.com/CarbCFMCalc.html

my 304 with a mild build 5500 max rpm and 80% efficiency requires a high 300 to low 400 CFm Carb
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