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Are these stock rod bolts on my 401?

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=97191
Printed Date: Mar/28/2024 at 6:38am
Software Version: Web Wiz Forums 12.03 - http://www.webwizforums.com


Topic: Are these stock rod bolts on my 401?
Posted By: JolleyGreenSST
Subject: Are these stock rod bolts on my 401?
Date Posted: Nov/08/2018 at 3:23am
I was working on my 401 and noticed the rods are 12 point nuts and I seen a a youtube video of another AMC engine being torn down and it had standard 6 point nuts on the rod bolts... So I was wondering if these were stock or anything speciale (they have F A stamped on the head also) and another question if anyone can confirm these are the factory forged rods by looking at them, I'd appreciate it.
Thanks. 

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https://flic.kr/p/QBtYFq" rel="nofollow"> https://flic.kr/p/QBtYFq" rel="nofollow - 20181107_180711 by https://www.flickr.com/photos/163232977@N08/" rel="nofollow - David Cruz , on Flickr

https://flic.kr/p/2cENPDs" rel="nofollow"> https://flic.kr/p/2cENPDs" rel="nofollow - 20181107_180727 by https://www.flickr.com/photos/163232977@N08/" rel="nofollow - David Cruz , on Flickr


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"God is good all the time and all the time God is good!"



Replies:
Posted By: 401MATCOUPE
Date Posted: Nov/08/2018 at 4:37am
Yes.....factory original on 390 and 401.  290/304/343/360 had 6 point fasteners (nuts)

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Ross K. Peterson
68X,GoPac,343,AT,52A(1stCar)
68X,GoPac,390,4sp,52A
69X,GoPac,390,4sp,64A
70X,GoPac,390,4sp,87A,8
70X,GoPac,390,4sp,BBO,8
70 Jav SST,390,AT,BSO
74MatX,401,AT,Prototype
74MatX,401,AT


Posted By: jpnjim
Date Posted: Nov/08/2018 at 6:03am
Originally posted by 401MATCOUPE 401MATCOUPE wrote:

Yes.....factory original on 390 and 401.  290/304/343/360 had 6 point fasteners (nuts)

^ agree


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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords


Posted By: PROSTOCKTOM
Date Posted: Nov/08/2018 at 8:34am
Originally posted by JolleyGreenSST JolleyGreenSST wrote:

I was working on my 401 and noticed the rods are 12 point nuts and I seen a a youtube video of another AMC engine being torn down and it had standard 6 point nuts on the rod bolts... So I was wondering if these were stock or anything speciale (they have F A stamped on the head also) and another question if anyone can confirm these are the factory forged rods by looking at them, I'd appreciate it.
Thanks

Sorry to bust your bubble, but they are stock rods, bolts, and nuts. Here's a photo of a stock 401 I bought last year that came out of a 63,000 mile International pickup and you can see it too has those 12-pt. nuts.



Tom




Posted By: tufcj
Date Posted: Nov/08/2018 at 1:30pm
All 390 and 401 engines had forged crank and rods from the factory.  Those are factory rods.

Bob
tufcj


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69 AMX
74 Javelin AMX
67 Rogue

If you need a tool and don't buy it...
you'll eventually pay for it...
and not have it.
Henry Ford


Posted By: JolleyGreenSST
Date Posted: Nov/08/2018 at 2:26pm
Originally posted by PROSTOCKTOM PROSTOCKTOM wrote:


Originally posted by JolleyGreenSST JolleyGreenSST wrote:

I was working on my 401 and noticed the rods are 12 point nuts and I seen a a youtube video of another AMC engine being torn down and it had standard 6 point nuts on the rod bolts... So I was wondering if these were stock or anything speciale (they have F A stamped on the head also) and another question if anyone can confirm these are the factory forged rods by looking at them, I'd appreciate it.
Thanks

Sorry to bust your bubble, but they are stock rods, bolts, and nuts. Here's a photo of a stock 401 I bought last year that came out of a 63,000 mile International pickup and you can see it too has those 12-pt. nuts.



Tom
<span style="font-size: 0.75em;">
</span>


Thanks for the picture confirmation! 🖒

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"God is good all the time and all the time God is good!"


Posted By: JolleyGreenSST
Date Posted: Nov/08/2018 at 2:28pm
Originally posted by tufcj tufcj wrote:

All 390 and 401 engines had forged crank and rods from the factory.  Those are factory rods.

Bob
tufcj

Thank you everyone for the replies I was aware already that all the 390 and 4 ones were Factory forged rods and crank, but because this engine has been rebuilt at least once if not more in the past I was wondering if anyone might have changed parts. But thank you all for confirming that it is original equipment. On a side note does anyone know if goes bolts are reusable or if it's recommended that I replaced them?

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"God is good all the time and all the time God is good!"


Posted By: tufcj
Date Posted: Nov/08/2018 at 4:25pm
50 year old bolts that have already been through at least one rebuild.  Put in ARP bolts and have the big ends resized.  Cheap insurance, and a small fraction of the cost of a rebuild.

Bob
tufcj


-------------
69 AMX
74 Javelin AMX
67 Rogue

If you need a tool and don't buy it...
you'll eventually pay for it...
and not have it.
Henry Ford


Posted By: PROSTOCKTOM
Date Posted: Nov/08/2018 at 10:25pm
Just installing a set of ARP bolts and having them resized will now cost you over $200. I can sell you brand new Molnar rods for $575 a set shipped. Little bit of a price difference, but if your going to spend money on 50 year old stock rods you might as well just put that money toward a new set. 

Tom


Posted By: JolleyGreenSST
Date Posted: Nov/08/2018 at 10:48pm
Originally posted by tufcj tufcj wrote:

50 year old bolts that have already been through at least one rebuild.  Put in ARP bolts and have the big ends resized.  Cheap insurance, and a small fraction of the cost of a rebuild.

Bob
tufcj



I don't think I'm going to build it to a crazy high power level... probably going to keep it close to stock, I have a performer intake and maybe a small cam with the stock hi flow manifolds... I need to save some funds for the suspension and interior. If I could afford to go full out I would but I have a tight budget for this kinda stuff.

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"God is good all the time and all the time God is good!"



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