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Identifing 401 390 crank

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    Posted: Mar/16/2018 at 3:28pm
I'm trying to identify what crankshafts I have, casting # 3196921 on both,and dates is 3 -70  other 9-69.
So are these 70 390 cranks or 401, according to casting #s the are 401s

73 401 Pierre Cardin X P1
73 401 Pierre Cardin X F3     70 X 390 4spd
69 X 401 6 spd
69 AMX 401 auto BSO
73 AMX 401 4speed pc
73 vette 427sb 5spd
73 vette convt.?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lyle Quote  Post ReplyReply Direct Link To This Post Posted: Mar/16/2018 at 4:03pm
Long standing AMC who knows on this one:
http://theamcforum.com/forum/crankshaft-319-6921-casting-number_topic30621.html
I believe your going to have to measure the stroke on each one to ensure what you have.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 304-dude Quote  Post ReplyReply Direct Link To This Post Posted: Mar/16/2018 at 4:24pm
401 has larger counter balances. Would not think a 69 stamp would cover the 401 manufacturing date.
71 Javelin SST body
390 69 crank, 70 block & heads
NASCAR SB2 rods & pistons
78 Jeep TH400 w/ 2.76 Low
50/50 Ford-AMC Suspension
79 F150 rear & 8.8 axles
Ford Racing 3.25 gears & 9" /w Detroit locker
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Post Options Post Options   Thanks (0) Thanks(0)   Quote addic Quote  Post ReplyReply Direct Link To This Post Posted: Mar/16/2018 at 9:16pm
the dates should tell what I have correct,date stamp 69 would be 390 and 70 is either 70 390 0r 401,
I did see where on casting #3196921 the last # looks to be stamped over a 2
73 401 Pierre Cardin X P1
73 401 Pierre Cardin X F3     70 X 390 4spd
69 X 401 6 spd
69 AMX 401 auto BSO
73 AMX 401 4speed pc
73 vette 427sb 5spd
73 vette convt.?
08 zx14
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Post Options Post Options   Thanks (0) Thanks(0)   Quote addic Quote  Post ReplyReply Direct Link To This Post Posted: Mar/16/2018 at 9:33pm
73 401 Pierre Cardin X P1
73 401 Pierre Cardin X F3     70 X 390 4spd
69 X 401 6 spd
69 AMX 401 auto BSO
73 AMX 401 4speed pc
73 vette 427sb 5spd
73 vette convt.?
08 zx14
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Post Options Post Options   Thanks (0) Thanks(0)   Quote addic Quote  Post ReplyReply Direct Link To This Post Posted: Mar/17/2018 at 10:13am
Are the 69 390 crank same as 70 390,same stroke  
73 401 Pierre Cardin X P1
73 401 Pierre Cardin X F3     70 X 390 4spd
69 X 401 6 spd
69 AMX 401 auto BSO
73 AMX 401 4speed pc
73 vette 427sb 5spd
73 vette convt.?
08 zx14
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ramblinrev Quote  Post ReplyReply Direct Link To This Post Posted: Mar/17/2018 at 10:23am
Not sure about your last question, but '68-69 390 cranks are the same; '70 390 crank is different. 
74 Hornet Hatchback X twins (since 1977)
62 American Convertible (still worth the $50 I spent in 1973!) AMCRC #513, AMO #384
70 AMX 360 4-speed (since 1981)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote addic Quote  Post ReplyReply Direct Link To This Post Posted: Mar/17/2018 at 10:28am
73 401 Pierre Cardin X P1
73 401 Pierre Cardin X F3     70 X 390 4spd
69 X 401 6 spd
69 AMX 401 auto BSO
73 AMX 401 4speed pc
73 vette 427sb 5spd
73 vette convt.?
08 zx14
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Post Options Post Options   Thanks (0) Thanks(0)   Quote addic Quote  Post ReplyReply Direct Link To This Post Posted: Mar/17/2018 at 10:29am
73 401 Pierre Cardin X P1
73 401 Pierre Cardin X F3     70 X 390 4spd
69 X 401 6 spd
69 AMX 401 auto BSO
73 AMX 401 4speed pc
73 vette 427sb 5spd
73 vette convt.?
08 zx14
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PROSTOCKTOM Quote  Post ReplyReply Direct Link To This Post Posted: Mar/17/2018 at 12:28pm
That last photo looks like the rod journal is offset ground for a stroker.

Since I see an aftermarket rod in another photo you need to measure it all.

Tom

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