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  #1  
Old 04-07-2008, 08:02 AM
scottsaint401 scottsaint401 is offline
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Location: wi
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401 intake and carb ?'s 2 or 4 barrel

Hey guys I am new to the amc 401 and was looking for some opinions on carbing the 401. I had a waggy with a 360 in it and roasted a couple of main bearings when I broke the oil pump housing somehow. I have since purchased another 74 waggy with a 401 in it. I am getting ready to put the motor back together and had some questions on the intake and carb.

I will be using a stock intake for now, to many other projects going on to get a different right now. I have the 2 barrel intake and carb off the 360 or I have the four barrel intake and carb off the 401.

-I need to know if I must run the 4 barrel with the 401 or will it be able to breathe enough if I use the 2 barrel?

-This waggy will only be used for trails and mud

-What about running the 2 barrel carb on the 4 barrel intake, sort of like circle track racing guys do?

I will be installing a sum 8600 cam with headers and fresh tune on the motor. Any help would be appreciated, thanks
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  #2  
Old 04-07-2008, 08:49 AM
Ristow Ristow is offline
 
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i ran the small,1.08 2 barrel on my mild cam'd 401 for some time. ran very well,but anemic at mid to high rom.
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  #3  
Old 04-07-2008, 08:53 AM
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fulsizjeep fulsizjeep is offline
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Join Date: Aug 21, 2002
Location: Jubilee Jeeps.SWCO
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The stock 4 bbl intake is designed for the Motorcraft 4350 carb. To fit anything else requires the right adapter or to modify a Quadrajet to square bore adapter. I imagine the 401 will run OK with a 2 bbl. You may want to start looking around for an Edelbrock Performer intake. That is the popular 4 bbl upgrade for 360/401.

.....and welcome to the forum!
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Ran when parked.
http://jubileejeeps.org/quadratrac
88 GW, 401/727/208, 5" lift, D44s/4.10s/locked up, 35s and a few Evil Twin mods, http://eviltwinfab.com and a few TT's Fabworks mods, http://www.ttsfabworks.com
76 401 Wag, 77 401 Wag, 77 401 J20
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  #4  
Old 04-07-2008, 10:17 AM
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HARDCORE pacer HARDCORE pacer is offline
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2 bbls came from the factory on the AMC 401s that came in the international pickups. The 4bbl intake you have if it is the original 74 one will be square bore and not spreadbore. There are lots of carbs that will bolt on and adapters to get any other carb on you want. I personally would put on a reman Qjet adapter is $15 and if you get the Qjet from the erly 70s BB buick with an auto the linkage is even very close for an auto. Dont waste your money on the edelbrock carbs or the performer intake. The performer and your factory square bore intake flow the same amount of air. If you must upgrade your intake by the airgapper that is the best offroad intake for an AMC v-8.
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78 pacer on 75 chero frame thats shortened 10\" and shackle reversal, D60 front with spool,14ff with detroit locker 4.56s in both,500 hp/500 ftlb torque 401,built 727,208 to divorced 205 doubler,on 46x21 ag tires
78 cj 360, 3spd, scout 44s with detroits SOAed with 36"tsl and beadlocks

Last edited by HARDCORE pacer : 04-07-2008 at 10:24 AM.
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  #5  
Old 04-07-2008, 10:36 AM
scottsaint401 scottsaint401 is offline
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thanks guys, this is the kind of info I am looking for. I used the motorcraft 2100 on my 360 and never had any problems with it, I know the 360 had enough umphh in the wag, I just do not know much about the 401 capabilities. thanks
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  #6  
Old 04-07-2008, 12:36 PM
fulsizjeep's Avatar
fulsizjeep fulsizjeep is offline
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2 BBL carbs came on 401s in CA too. I think the 401 offering in CA ended in 75 or 76. I thought the square bore 4 bbl intake ended at the end of 73 models, but it is very possible some 74s had square bore intake. If you have a square bore factory intake, I agree with HARDCORE pacer.

I don't know if I agree on the air-gapper though, but that is just me.

Telling someone to not waste money on Edelbrock is kind of a wide open statement based in personal opinion. I think it works better to say in your experience Edelbrock is junk and not say don't waste money on Edelbrock carbs and intakes. We have 2 401s with AFBs and they run good. Ryan has a Edelbrock on his 360 Cherokee and it runs dam good too. oh well...


Quote:
Originally Posted by HARDCORE pacer
2 bbls came from the factory on the AMC 401s that came in the international pickups. The 4bbl intake you have if it is the original 74 one will be square bore and not spreadbore. There are lots of carbs that will bolt on and adapters to get any other carb on you want. I personally would put on a reman Qjet adapter is $15 and if you get the Qjet from the erly 70s BB buick with an auto the linkage is even very close for an auto. Dont waste your money on the edelbrock carbs or the performer intake. The performer and your factory square bore intake flow the same amount of air. If you must upgrade your intake by the airgapper that is the best offroad intake for an AMC v-8.
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Ran when parked.
http://jubileejeeps.org/quadratrac
88 GW, 401/727/208, 5" lift, D44s/4.10s/locked up, 35s and a few Evil Twin mods, http://eviltwinfab.com and a few TT's Fabworks mods, http://www.ttsfabworks.com
76 401 Wag, 77 401 Wag, 77 401 J20
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  #7  
Old 04-07-2008, 01:07 PM
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willysworker willysworker is offline
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My AMC 360 has an Edelbrock carb and Performer intake manifold. I really don't see why many talk it down. It works very well on my street / trail rig. Now if my need was for extreme wheeling only, sure I'd be running something different. 1st choice, Propane. Fuel Injection may be a future change for my rig but for now I'm happy with Edelbrock.
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  #8  
Old 04-07-2008, 01:08 PM
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fulsizjeep fulsizjeep is offline
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Join Date: Aug 21, 2002
Location: Jubilee Jeeps.SWCO
Posts: 22,268
If you look at this:
http://www.edelbrock.com/automotive_new/mc/manifolds/amc/amc.shtml
You will see the primary difference in the Performer and Air Gap manifolds is in the power band/rpm range.

http://www.jeepfan.com/reviews/review_edelperfrpm.htm
I also read here the new new Performer Air-Gap manifolds are ideal for street performance from idle-to-5500 rpm.

So, take your choice...
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Flint
Ran when parked.
http://jubileejeeps.org/quadratrac
88 GW, 401/727/208, 5" lift, D44s/4.10s/locked up, 35s and a few Evil Twin mods, http://eviltwinfab.com and a few TT's Fabworks mods, http://www.ttsfabworks.com
76 401 Wag, 77 401 Wag, 77 401 J20
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  #9  
Old 04-09-2008, 06:55 AM
scottsaint401 scottsaint401 is offline
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Join Date: Jan 23, 2008
Location: wi
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Thanks guys, I just wanted to say thanks for the recommondations, I will let you know how it all goes, I think I will go with the 2 barrel for now and get the bugs worked out and broke in. Thanks scott
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