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amc 390 engine |
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american opel 
AMC Apprentice 
Joined: Jun/17/2011 Status: Offline Points: 32 |
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 Topic: amc 390 enginePosted: May/11/2012 at 5:53am |
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well back to wv.to go get the motor.barry hade alot of problems with the 401 but it's finally done.one a safe tune it's making 566hp.thats about 200 more hp.than the 360.im going to have to figure out my car all over again!
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SKeown
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Joined: Jul/30/2009 Location: Texas Status: Offline Points: 2041 |
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Posted: Apr/03/2012 at 6:59am |
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I've just now seen this thread. In my openion the rod went first, a classic spun/stacked bearing. If the cam was spared you're luckier than most. How did the main that fed that bearing look? Did you inspect the contents of the oil filter? I seriusely doubt the whole thing developed on that one pass, it just finally got loose enough for the bearings to overlap. At that point the rod seized on the crank and all heck broke loose. Good luck with the new engine! BTW, King bearings are availiable now, Barry swears by them and likely has some at his shop.
I had essentially the same thing develope on my 406, the bearing didn't spin, but it would have if I hadn't cought the copper in the filter. The number 6 bearing was definately loose, the cause was trash from the main that fed it. That was due to a tight number 4 main from a poor line bore job. I had that rod resized/shot peened and the rod journals turned .010, in addition to a proper line honing. My oil pressure, like you'rs didn't indicate trouble either. That's when I decided to stroke the engine to 435 inches.
This brought back memories. In the late 60's and early 70's I was a line mechanic at a Buick agency in Beaumont TX. That place had the distinction of having a fellow named Jim O'Brian, the worlds greatest Opal salesman. Needless to say, the bulk of my work was installing air cond in Opals, none came with radios or AC. The engines were half decent, but the Solex carbs were pure crap and mainly responsible for customer dissatisfaction.
SKeown Edited by SKeown - Apr/03/2012 at 7:22am |
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american opel
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Joined: Jun/17/2011 Status: Offline Points: 32 |
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Posted: Apr/03/2012 at 4:46am |
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well we are off to west virgina!!!hopeing barry allen doesnt find anything wrong with the engine and the dyno #s are high!!!!
Edited by american opel - Apr/03/2012 at 4:47am |
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american opel
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Joined: Jun/17/2011 Status: Offline Points: 32 |
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Posted: Mar/31/2012 at 10:33am |
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well i started putting the new cam in my new 401 3 days ago and the bearings are to tight!!i called barry allen and asked him if i could bring it to hin to clearance them and finish putting it together.he said not a problem.im also having him break it in and dyno it!!!im so scared because of all the money i have in it.ill try to put up some pics.soon
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american opel
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Posted: Jul/22/2011 at 5:41am |
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^^^^^thanks futten.yeah i live in ohio.yeah there isnt alot of them around here.the gt's are alittle easier to find.i have only seen one other kadett before and it was a wagon!!
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futten
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Joined: Mar/08/2010 Location: norway Status: Offline Points: 142 |
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Posted: Jul/21/2011 at 7:43am |
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that is one bad rump kadett do you live in the state? arent those kadetts real had to come by these days?
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american opel
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Posted: Jul/21/2011 at 6:28am |
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american opel
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Posted: Jul/21/2011 at 6:03am |
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i dont think it was due to oil.i was watching the oil pressure and water temp gauge the whole time.is a habit that i have learned the hard way.when everything went south i had over 52lbs of oil pressure.i also run 6 quarts of oil and a pint of assem.lube in it.i looked real hard at the rod nuts and bolt yesterday.i really think the bearing{clevite}delaminated.i have heard of this happening with amc's before.i knew this but i couldnt find any old federal or acl's.king still doesnt make them as far as i know.as i said earlyer the bearing on #2 rod is still there and the crank looks good on that side with no heat marks or anything but there is only about half of it left.#3 also looks good.
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amx39068
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Joined: Feb/21/2008 Location: Arizona Status: Offline Points: 10077 |
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Posted: Jul/20/2011 at 11:32am |
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Wow. That is some nasty looking damage. Hard to tell which was the chicken and which was the egg - the piston let go and trashed the rod or the rod let go and trashed the piston. Either way I suspect you will have to check very closely for some additional block or head damage.
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Dan Curtis, AZ AMC collector quality Restorations, Parts & Engines - amcmusclecars.com
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tsanchez
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Joined: Jul/09/2007 Location: Arizona Status: Offline Points: 2694 |
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Posted: Jul/20/2011 at 8:55am |
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I agree, need a bigger pan especially with the wheelie action.
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