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Unread 01-31-2013, 05:36 PM   #1
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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Unread 01-31-2013, 06:48 PM   #2
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.
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Unread 01-31-2013, 06:50 PM   #3
turbonusse2
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http://www.jpmagazine.com/techarticl...r/viewall.html

sorry this link works
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Unread 01-31-2013, 07:29 PM   #4
bear991
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Thanks Turbo, Good info
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Unread 01-31-2013, 08:09 PM   #5
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.
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Unread 01-31-2013, 08:19 PM   #6
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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Unread 01-31-2013, 08:25 PM   #7
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.
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Unread 02-01-2013, 06:59 AM   #8
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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Unread 02-01-2013, 07:54 AM   #9
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.
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Unread 02-01-2013, 10:29 AM   #10
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...
carb-shop.jpg   intake.jpg  
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Unread 02-01-2013, 04:11 PM   #11
Matt1981CJ7
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Steve,

You got that Holley running, yet?

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

Matt
trottlebracket1.jpg  
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Unread 02-02-2013, 04:33 PM   #12
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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Unread 02-04-2013, 12:06 PM   #13
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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Unread 02-04-2013, 12:16 PM   #14
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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Unread 02-04-2013, 12:58 PM   #15
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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