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
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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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------------- "God is good all the time and all the time God is good!"
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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)
------------- 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
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Posted By: jpnjim
Date Posted: Nov/08/2018 at 6:03am
401MATCOUPE wrote:
Yes.....factory original on 390 and 401. 290/304/343/360 had 6 point fasteners (nuts) |
^ agree
------------- 71 P-code 4spd Javelin/AMX some Jeeps and some Fords
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Posted By: PROSTOCKTOM
Date Posted: Nov/08/2018 at 8:34am
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
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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
------------- 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
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Posted By: JolleyGreenSST
Date Posted: Nov/08/2018 at 2:26pm
PROSTOCKTOM wrote:
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! 🖒
------------- "God is good all the time and all the time God is good!"
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Posted By: JolleyGreenSST
Date Posted: Nov/08/2018 at 2:28pm
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?
------------- "God is good all the time and all the time God is good!"
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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
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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
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Posted By: JolleyGreenSST
Date Posted: Nov/08/2018 at 10:48pm
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.
------------- "God is good all the time and all the time God is good!"
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