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Formulation of AMC cast iron

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74Bubblefender View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 74Bubblefender Quote  Post ReplyReply Direct Link To This Post Posted: Jan/24/2014 at 12:09pm
My theory is that the Nickel was used in 401 blocks only
We are just about to forge new AMC V8 crankshafts.. please check here
http://www.bulltear.com/forums/showthread.php?19564
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Boris Badanov Quote  Post ReplyReply Direct Link To This Post Posted: Jan/24/2014 at 12:19pm
When I worked for Thompson Center / KW Thompson tool we recycled nearly 100%.
The chips and scrap from the manufacturing side also got recycled in the foundry.
The only throw away scrap was the unrecoverable stuff mixed with dirt on the floor.
I am unaware of hot the mix was mantained, but we never had a bad run
that I am aware of. We manufactured firearms so it had to be near perfect.
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote WARBED Quote  Post ReplyReply Direct Link To This Post Posted: Jan/24/2014 at 4:06pm
I've had a lot of machine work done over the years and the first I ever heard about different grades of cast iron is when my machinist mentioned the hardness of the AMC block compared to other blocks. He did mention IH and some 350 Chevys being made the same way. I just recently ridge reamed a Chevy 305 and it cut like butter compared to a  AMC. Seams like all manufacturers had there different recipes for casting alloys and like chefs kept them a well guarded secret.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Aljav Quote  Post ReplyReply Direct Link To This Post Posted: Jan/25/2014 at 11:16pm
AMC used Central Foundries which is owned by GM. AMC changed sometime in the 70's to a foundry in Canada. The central foundry casting are said to be much better casting. I believe when said to be "better" its just overall quality. Not sure if formulas changed.  

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Boris Badanov Quote  Post ReplyReply Direct Link To This Post Posted: Jan/26/2014 at 7:58am
The 390s and 401s I have seen have had excellent
casting quality and little core shift. I can't say that about
the 304s and 360s. They have been hit or miss. One 360
I pulled out of a Gremlin (no clue as to the origins) was
so severly core shifted I wondered how it ran without
breaking up.
 
Obviously the 304 and 360 were bread and butter engines for
AMC and Chrysler, the 390 and 401 were flagship motors.
 
I am presently building a 1975 401, again little to no core shift.
Any clue as to where it was cast?
 
The 502 head castings are nasty and getting a lot of expensive port work.
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hurst390 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/26/2014 at 9:08am
Originally posted by Aljav Aljav wrote:

AMC used Central Foundries which is owned by GM. AMC changed sometime in the 70's to a foundry in Canada. The central foundry casting are said to be much better casting. I believe when said to be "better" its just overall quality. Not sure if formulas changed.  

Allan

That's makes sense as to why the later 401 blocks seem to be thinner wall...depending on which way the casting number at the rear faces...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 74Bubblefender Quote  Post ReplyReply Direct Link To This Post Posted: Jan/26/2014 at 10:13am
Originally posted by Aljav Aljav wrote:

AMC used Central Foundries which is owned by GM. AMC changed sometime in the 70's to a foundry in Canada. The central foundry casting are said to be much better casting. I believe when said to be "better" its just overall quality. Not sure if formulas changed.  

Allan


They also used a foundry in Racine. The foundry in Racine did at least all the aluminum castings for them.
We are just about to forge new AMC V8 crankshafts.. please check here
http://www.bulltear.com/forums/showthread.php?19564
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Buzzman72 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/26/2014 at 1:31pm
Originally posted by Boris Badanov Boris Badanov wrote:

 
Obviously the 304 and 360 were bread and butter engines for
AMC and Chrysler, the 390 and 401 were flagship motors.
 
Boris Badanov

Chrysler bought AMC in 1987.

How many '87 and later 304's were built?  What vehicles were they found in?

[I don't know of ANY...therefore, 304's built by Chrysler must be EXTREMELY rare.]
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Boris Badanov Quote  Post ReplyReply Direct Link To This Post Posted: Jan/26/2014 at 1:40pm
360 was used in Chrysler built Jeeps till 1991 as far as I know.
304? Not sure, but I did lump them into the same statement.
 
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Aljav Quote  Post ReplyReply Direct Link To This Post Posted: Jan/26/2014 at 1:48pm
I believe that all Central Foundries had a CF on the block in the Valleys

Even Wally Booth said the CF Blocks were a bit better. He dealt with the Canada Foundry for a few of his last blocks.

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