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  #1  
Old 01-29-2009, 07:17 PM
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Sambo Sambo is offline
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lost a motor AGAIN!

about ready to throw in the towel i lost a cyl in the motor thats not even 2 yrs old yet!
i am either going chevy of going to a diffrent vehicle!
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  #2  
Old 01-29-2009, 08:00 PM
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lost a cylinder as in lost the valve in that cylinder, or blown rings, or blown piston, or naturally-ventilated the block?
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  #3  
Old 01-29-2009, 08:17 PM
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That sucks but was it really a random engine problem or was it the way it was built? I would put my AMC 401 against any Chevy for durability.
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  #4  
Old 01-29-2009, 08:41 PM
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Quote:
Originally Posted by PlasticBoob
That sucks but was it really a random engine problem or was it the way it was built? I would put my AMC 401 against any Chevy for durability.
I feel the same way about the 360 in my CJ, wouldnt hesitate to drive it anywhere.
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  #5  
Old 01-29-2009, 08:52 PM
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maccj5 maccj5 is offline
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got a 87 grand wag 360 140,000 miles no smoke runs like a top
the 727 trans-------well i do a lot of praying every time i put it in gear
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its a jeep thing i dont understand either
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  #6  
Old 01-29-2009, 09:03 PM
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I would put my 401 up against just about anything for durability, and reliability, i beat the snot out of my Waggoneer out on the rocks, mud, trails, sand and hills. Before i put a hole in the oil pan the motor had 168,000 miles on it, would probably still be running, if i would have realized the pan had a hole. Now its been bored and all the gooies and runs better than ever.
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  #7  
Old 01-29-2009, 11:24 PM
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What were you doing when it let go?
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  #8  
Old 01-29-2009, 11:43 PM
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As others have said the AMC motors are very durable and can put out lots of power. I've only ever had issues when I've had oiling problems, usually the timing or dizzy gears will go before something more serious happens.
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  #9  
Old 01-30-2009, 12:20 AM
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Go Chevy!!! Its the best thing you can do for your Jeep. At least it was for me!

Throw a rebuilt 350 in there and be done. Heck, even an old one will do. I had an old bone stock 350 in one and it ran awesone. Way more power than my old jeep with 360. And now I'm in the process of building a TBI 454

But thats just my opinion lol
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  #10  
Old 01-30-2009, 12:21 AM
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don't mean to pick a fight, but are you guys serious? not many here have hit 200k on their AMC's without digging into them. 150k is nothing IMO for a motor to blow through.

my SBC has a hair under 300k on it, original motor! i know of a lot more high mileage sbc's then amc's....

Al
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  #11  
Old 01-30-2009, 12:35 AM
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341Km..... but it may not make 342.... still working on a vibration. Will do compression next time I have a chance.

What happened, conditions....
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74 wag, 349Kmiles on original ticker/trany, except for the rust. Will it make it to the next get together without a rebuilt? Status: needs a new body.
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  #12  
Old 01-30-2009, 12:36 AM
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Well, when I said I would put up my 401, I really meant MY 401 - we all know these engines have bugs, but once you fix the little issues (oiling system and timing chain mainly), I really do believe these engines would outlast any Chevy 350 or 454 - especially the 401 with forged crank/rods. I would put a huge sum of money on my current 401 going to 300k easy.

As for money spent, Chevy sure is the cheaper route, and some day when AMCs are impossible to find, I might have to go that route, although I have a spare 401 I might build up for LPG. Then again I may go with a Cummins 4BT. Who cares about cost anyway? You gotta pay to play with these toys.

My friend has a '71 Blazer with a mild 350 (headers, intake, carb, possibly cam but I doubt it) - and has way less power than my friend's J-10 with a 360 and 2bbl carb - not to mention the Blazer is VERY light! To get the Blazer to do anything, it has to rev, rev, rev! Fail.
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1974 Cherokee S, fuel injected 401, Trans-am Red, Aussie locker 'out back'
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  #13  
Old 01-30-2009, 12:49 AM
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I wish I knew what 401s were worth when I got rid of mine

I wanted to GIVE away my old 401 (ran, but not too good, sat for 6 years) with a bad th400 and bad QT. But the guy who wanted it would not take it for free lol. So he gave me 50 bucks. He tore it apart and I guess it wasn't that bad. Oh well..... probably could have got more for it.
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  #14  
Old 01-30-2009, 12:53 AM
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Sorry for the hijack man
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  #15  
Old 01-30-2009, 02:10 AM
elbastardo elbastardo is offline
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I loved my 401 20 combo. But i went to the SBC combo for the ease and price. I now run the 203/205/465.
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  #16  
Old 01-30-2009, 05:48 AM
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lost the rings me thinks! smoking real good off left bank...possible culprit #1 cyl.
i also have an oil leak near #1 on the exhaust mani now,that i just noticed after getting home...

i friend gave me a 350 to build,and a kid i work with said he can get me a 700r4 cheap enough
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77 chero DEAD.
84wag,360,tf727,???! possiblities are d300 flipped and a ford d44 hp with coils
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  #17  
Old 01-30-2009, 07:14 AM
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Lindel Lindel is offline
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Sam, I'd go the 350/700R4 route myself. Your D300 will bolt willingly enough to it (you'll need another adapter obviously) but I think you'll be happier in the long run.
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  #18  
Old 01-30-2009, 07:28 AM
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Quote:
Originally Posted by AlsChopShop
don't mean to pick a fight, but are you guys serious? not many here have hit 200k on their AMC's without digging into them. 150k is nothing IMO for a motor to blow through.



I don't think thats necessarily an engine fault so much as FSJs usually don't make it to 200k as a whole vehicle.
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  #19  
Old 01-30-2009, 07:32 AM
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I don't know if you rebuilt the last one or not but sometimes it's the mechanic. Not trying to start anything but sometimes even the best of us mess up.

I flog the crap outta my 360 and it's still holding strong. I don't know, maybe you have bad luck.
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I would think boxing would limit the amount the frame could flex over obstacles which I think IMO would be a bad thing. I would think you would want all the articulation possible.
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  #20  
Old 01-30-2009, 09:33 AM
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Probably broke the ring lands off the top of the piston. (which is detonation) Or collapsed/broke a skirt. (which is overheating or detonation)

Not the name on the valve cover.

I daily drive 2 different 180,000 mile late grand waggies with the 360.

I have had good and bad luck with just about every domestic V8.

If I ever decide that I REALLY need big cubic inches, I will PROBABLY do a 505 inch Ford 460. Not because I like them. Because it bolts straight to my NP435. There are success stories and horror stories for every engine on the road.

peace
Dave
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