AMC 401 rebuild - JeepForum.com
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post #1 of 22 Old 08-19-2017, 06:41 PM Thread Starter
AZ_Chip
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OK, I am going in to the rebuild on my 401. My driving will be some highway, some trails. No extreme rock crawling. I want to run a Edlebrock intake and some form of fuel injection. I am liking more and more the ones on the market. I am thinking Holley Sniper. This is my first rebuild of an engine. No idea on shops in my area. Could use solid advice on cams, pistons, and any other things I should know. I will make this thread my build thread for this engine so you can see the good and the bad, and my screw ups! Thanks, Craig

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post #2 of 22 Old 08-19-2017, 07:40 PM
Matt1981CJ7
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Oh boy!!

I'm to lazy right now to type out a lengthy response. But you can read about my adventure in my "World's Ugliest AMC 360" thread. Pop some corn, and have a few hours to spare.

Overall, I've been very pleased with my build. I've had one hiccup with a faulty rocker, but otherwise, it's been reliable and a ton of fun.

Matt


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post #3 of 22 Old 08-19-2017, 08:33 PM
Brianscj5
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http://www.jeepforum.com/forum/f8/wo...360-a-1354590/

I've been using this as my bible for my 360 swap. Thank you Matt for such a good detailed write up.
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post #4 of 22 Old 08-19-2017, 08:37 PM
swatson454
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You got your money tree well-pruned and fertilized? We can spend you out of house and home before we get to the valve covers


Shawn

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post #5 of 22 Old 08-19-2017, 10:01 PM
Matt1981CJ7
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Quote:
Originally Posted by Brianscj5 View Post
http://www.jeepforum.com/forum/f8/wo...360-a-1354590/

I've been using this as my bible for my 360 swap. Thank you Matt for such a good detailed write up.
Thanks for the kind words, Brian.

I'd call it "A Dummies Guide to Rebuilding an Engine" instead of a bible, though.

Matt


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post #6 of 22 Old 08-19-2017, 10:21 PM
motiv8ya
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Quote:
Originally Posted by AZ_Chip
OK, I am going in to the rebuild on my 401. My driving will be some highway, some trails. No extreme rock crawling. I want to run a Edlebrock intake and some form of fuel injection. I am liking more and more the ones on the market. I am thinking Holley Sniper. This is my first rebuild of an engine. No idea on shops in my area. Could use solid advice on cams, pistons, and any other things I should know. I will make this thread my build thread for this engine so you can see the good and the bad, and my screw ups! Thanks, Craig
I rebuilt and swapped 401's into both of my CJ7's and put FI on them. One has a Howell Kit on an Edlebrock Airgap Manifold. The other had a JY TBI on an Edlebrock Performer Intake that I just replaced with the basic Fitech kit. I have to say that the Fitech Kit was the easiest of the three kits to install and only about $200.00 more than I spent on my JY Kit that I still couldn't get to run right.

Nothing fancy on either of my builds, just an RV Cam and a basic rebuild kit = plenty of power for a light CJ.
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post #7 of 22 Old 08-20-2017, 08:47 AM
swatson454
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Craig,

Do you have any idle quality requirements? Is a little rumble ok or are you after a smooth, stocker type of idle? Are you hoping to squeeze fuel mileage out of it; which is kind of funny but worth asking. Also, what are you planning for exhaust?

Can you find the casting numbers on the heads and post them?


Shawn

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Last edited by swatson454; 08-20-2017 at 10:20 AM.
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post #8 of 22 Old 08-21-2017, 02:27 AM Thread Starter
AZ_Chip
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Quote:
Originally Posted by Matt1981CJ7 View Post
Oh boy!!

I'm to lazy right now to type out a lengthy response. But you can read about my adventure in my "World's Ugliest AMC 360" thread. Pop some corn, and have a few hours to spare.

Overall, I've been very pleased with my build. I've had one hiccup with a faulty rocker, but otherwise, it's been reliable and a ton of fun.

Matt
Matt,

You might not know me at all. But I know you! From your light bulb enhancement thread and the "Worlds Ugliest AMC" thread. Your threads are dog eared bookmarks on my computer.

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post #9 of 22 Old 08-21-2017, 02:30 AM Thread Starter
AZ_Chip
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Originally Posted by swatson454 View Post
Craig,

Do you have any idle quality requirements? Is a little rumble ok or are you after a smooth, stocker type of idle? Are you hoping to squeeze fuel mileage out of it; which is kind of funny but worth asking. Also, what are you planning for exhaust?

Can you find the casting numbers on the heads and post them?


Shawn

Rumbly idle ok. No stumble.

Gas mileage? Would like to have at least a little. Seriously, if possible yes.

Exhaust, Have not researched a lot. But I do have emissions requirements here in Arizona.

I will look for and post the valve cover tag and casting numbers as soon as I can.

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post #10 of 22 Old 08-21-2017, 02:33 AM Thread Starter
AZ_Chip
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Quote:
Originally Posted by motiv8ya View Post
I rebuilt and swapped 401's into both of my CJ7's and put FI on them. One has a Howell Kit on an Edlebrock Airgap Manifold. The other had a JY TBI on an Edlebrock Performer Intake that I just replaced with the basic Fitech kit. I have to say that the Fitech Kit was the easiest of the three kits to install and only about $200.00 more than I spent on my JY Kit that I still couldn't get to run right.

Nothing fancy on either of my builds, just an RV Cam and a basic rebuild kit = plenty of power for a light CJ.
Good info! I have done a JY TBI on a 360 powered CJ7. It was not to bad. Went back to carb though. Think I had a program issue. Those new Snipers have me googly eyed. LOL.

My project


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post #11 of 22 Old 08-21-2017, 08:30 AM
swatson454
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Emissions? Well crap; I had you all cammed up for ~450 ft/lbs and still roughly 17 inches of manifold vacuum but that cam won't work now. I looked through a few shelf grinds and can't find anything that I'd personally use so...

Howard's Cams custom grind:

Intake lobe: HM2143294A- 261* advertised duration, 214* at .050, .527 lift
Exhaust lobe: 3HF219317- 266* advertised duration, 219* at .050, .507 lift
112 LSA, 108 ICL (112 +4)

Be sure to use a Flowmaster or equivalent y-pipe, high-flow cat and good muffler.


Shawn

Edit: Is that Sniper EFI gonna fly in Arizona?

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Last edited by swatson454; 08-21-2017 at 03:58 PM.
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post #12 of 22 Old 08-21-2017, 09:55 PM Thread Starter
AZ_Chip
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Quote:
Edit: Is that Sniper EFI gonna fly in Arizona?
It freaking better!

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post #13 of 22 Old 08-21-2017, 09:56 PM Thread Starter
AZ_Chip
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Quote:
Originally Posted by swatson454 View Post
Emissions? Well crap; I had you all cammed up for ~450 ft/lbs and still roughly 17 inches of manifold vacuum but that cam won't work now. I looked through a few shelf grinds and can't find anything that I'd personally use so...

Howard's Cams custom grind:

Intake lobe: HM2143294A- 261* advertised duration, 214* at .050, .527 lift
Exhaust lobe: 3HF219317- 266* advertised duration, 219* at .050, .507 lift
112 LSA, 108 ICL (112 +4)

Be sure to use a Flowmaster or equivalent y-pipe, high-flow cat and good muffler.


Shawn

Edit: Is that Sniper EFI gonna fly in Arizona?
Can I see the 450 ft lb one? If I move north there is no emissions requirement.

My project


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post #14 of 22 Old 08-21-2017, 09:58 PM Thread Starter
AZ_Chip
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Quote:
Be sure to use a Flowmaster or equivalent y-pipe, high-flow cat and good muffler.
3" or 2.5" Y? I was thinking 3".

My project


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post #15 of 22 Old 08-22-2017, 06:30 AM
swatson454
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Quote:
Originally Posted by AZ_Chip View Post
Can I see the 450 ft lb one? If I move north there is no emissions requirement.
Also a custom from Howard's Cams:

Intake lobe and exhaust lobe (single pattern): HM2163318A- 263* advertised duration, 216* at .050, .531 lift. 106 LSA, 102 ICL (106 +4)

At somewhere around 9.75:1 compression, you should be in the 375 hp range at 5,000 rpm and make right around 450 ft/lbs at 3,800 rpm and still have roughly 17 inches of manifold vacuum. I wouldn't be the least bit surprised if it broke the 400 ft/lb mark by 2,500.

I don't know if the heads will handle that valve lift so you'll have to check retainer to guide clearance and use the right valve springs.

Quote:
Originally Posted by AZ_Chip View Post
3" or 2.5" Y? I was thinking 3".
I'd do 2.5" inlets and 3" outlet.


Shawn
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Last edited by swatson454; 08-22-2017 at 07:17 AM.
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