401 Carb
Printed From: TheAMCForum.com
Category: The Garage
Forum Name: AMC V8 Engine Repair and Modifications
Forum Description: AMC-made V8 engine mechanical, ignition and fuel from basic repair to high-perf modifications
URL: https://theamcforum.com/forum/forum_posts.asp?TID=40270
Printed Date: Apr/19/2024 at 11:07am
Software Version: Web Wiz Forums 12.03 - http://www.webwizforums.com
Topic: 401 Carb
Posted By: STGKlopp
Subject: 401 Carb
Date Posted: Jun/06/2012 at 2:57pm
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Need some help picking a carb. Leaning towards this Holley. http://www.holley.com/0-82750 I'm starting to order parts for the Javelin. Mild build on the 401. Should be around 450 horse. Car will weigh in around 3300#. Pretty decided on 3.55:1 gears out back. Car will be mostly weekend fun, some track, and shows. Jereme |
Replies:
Posted By: kwkslvr73
Date Posted: Jun/06/2012 at 3:01pm
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I have the Holley Street Avenger 650 on my 360 bored 40 over and pretty big cam....best one I've tried. I'm sure you'll get plenty of other suggestions on this subject!
------------- 360 5-speed orig owner... http://s274.photobucket.com/user/gremlum/media/newwheels2012001.jpg.html" rel="nofollow"> 
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Posted By: whizkidder
Date Posted: Jun/06/2012 at 4:15pm
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I've got the Holley Ultra Double-Pumper w/electric choke on my 409 (.040 70 390 w/401 crank), Edelbrock heads, cam, air gap, 1 5/8" long tubes. Love it! Added a secondary idle adjustment bracket, but didn't touch any of the other settings. Ran/runs great out of the box. %20" rel="nofollow - http://www.summitracing.com/parts/HLY-0-76750BL ------------- Ron Frost marne1ancient @ gmail.com 910 nine two two 0563 "There is no limit to what a man can do, so long as he does not care a straw who gets credit for it. Charles Montague |
Posted By: Josh
Date Posted: Jun/06/2012 at 9:57pm
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I rebuilt a plain old 3310 750 vacuum secondary for my 401 (Torker, big Summit cam, headers, 3.89 gears etc.) and it loves it. I'd venture to say that carb in the link should work out well for you. ------------- ‘66 Marlin, 327/M10 ‘70 Rebel Machine, 390/M12 ‘74 Javelin AMX, 401/727 ‘80 Concord DL, 258/904 ‘98 Cherokee, 4.0/AW4 |
Posted By: STGKlopp
Date Posted: Jun/07/2012 at 8:08am
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Whizkidder, how do you like the Double Pumper? I bet that 409 is a thirsty beast. I guess I'm leaning towards the vacuum secondary to get a little more street-ability. Josh, How are the 3.89 gears on the highway? |
Posted By: STGKlopp
Date Posted: Jun/07/2012 at 8:10am
| I've also read that the carbs without chokes are dangerous and like to backfire. Anyone had that happen or heard of that? |
Posted By: Josh
Date Posted: Jun/07/2012 at 12:40pm
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They're not the best highway gear. I don't do a lot of highway driving with the Rambler but the few times I did I could hang with the slower traffic and keep the RPMs reasonable. I'd stay with the 3:55's if you're going to be on the highway a lot. ------------- ‘66 Marlin, 327/M10 ‘70 Rebel Machine, 390/M12 ‘74 Javelin AMX, 401/727 ‘80 Concord DL, 258/904 ‘98 Cherokee, 4.0/AW4 |
Posted By: 390spirit
Date Posted: Jun/07/2012 at 1:05pm
that's not true I have a 850 speed demon that I put on when I go to the track and a holley HP750 that i use on the street and neither 1 of them have the choke set up on them the tops of the carbs are all milled nice and smooth I drive my car in the winter months and have no problem starting it with no choke. If the timing is right it shouldn't backfire at all |
STGKlopp wrote:Posted By: STGKlopp
Date Posted: Jun/07/2012 at 1:14pm
| I wont be in the highway a lot but I do want to keep it reasonable. I want to be able to drive it to shows and might travel a bit to get there. How do you like the Torker? I'm looking at the Torker II myself. The cam on my list is a Lunati Voodoo Hydraulic flat tappet. (234/242 @.050, .547/.569 lift) I'm trying to find the right Carb for the combo. |
Posted By: amx39068
Date Posted: Jun/07/2012 at 2:02pm
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why not ask Lunati what they think you should use? ------------- Dan Curtis-Owner and CEO AZ AMC Restorations; Facebook: https://www.facebook.com/amcmusclecars/ & Curtis Real Estate Development 
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Posted By: STGKlopp
Date Posted: Jun/07/2012 at 2:14pm
| Good call. I guess I was just wondering what people are using on AMC engines. |
Posted By: 17tamx
Date Posted: Jun/07/2012 at 11:05pm
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How about using the Edelbrock AirGap with their AVS 800 cfm carb? They are made for each other and will work great with your cam and 3.54 gears. Since your red line is going to be 6,500 rpm for a street car your rpm range is going to be between 1,500 and 6,500 rpm with your peak torque around 5,400 rpm. Torque is what makes a car really dance on the street and the AirGap/AVS 800 will make more power than your tires are going to know what to do with. I am running this combo on my 70 390 AMX and I love it. I gasket matched the intake to the heads and I am running the AVS carb right out of the box with just the normal external adjustments. I bought the one with the electric choke and I am using one of the stock choke covers off of one of my old AMC Carter AFB'. ------------- Kirk P. Fletcher 70 AMX BBG w/Shadow 390 4sp 71 SC360 Wild Plum Ram Air 4sp 67 Rogue Convert 343 4sp 66 Rogue Hardtop 290 Auto 66 440 Convert 232 Auto |
Posted By: amx39068
Date Posted: Jun/08/2012 at 7:38am
I have the Eddy 800 AVS on the SC/Rumbler sitting on a Torker with pretty heavily street/strip ported big chamber heads using SpeedPro forged pistons and the 8601 cam big tube ceramic coated headers. The car literally has too much power to the point that I always have to be careful so as to not have it always going sideways in the first three gears. ------------- Dan Curtis-Owner and CEO AZ AMC Restorations; Facebook: https://www.facebook.com/amcmusclecars/ & Curtis Real Estate Development
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Posted By: 17tamx
Date Posted: Jun/08/2012 at 12:14pm
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Learn to steer with the rear end. It will add a smile to your face almost as fast as a naked pretty woman. ------------- Kirk P. Fletcher 70 AMX BBG w/Shadow 390 4sp 71 SC360 Wild Plum Ram Air 4sp 67 Rogue Convert 343 4sp 66 Rogue Hardtop 290 Auto 66 440 Convert 232 Auto |
Posted By: STGKlopp
Date Posted: Jun/09/2012 at 11:37am
| Growing up in the snow of Wisconsin I learned very early steering with the rear end. With this Javelin it sure is a blast "occasionally" gettin loose. As for the Carb I'm going to start with the vacuum secondary 750, I'll get the 50cc accelerator pump kit and go from there. I'll play around with jets and Discharge nozzles. If I don't think that's enough I'll go to the double pumper. I think the modular design of the Holley is going to make it easy to tune for the application. |