Re: [Amc-list] 390 vs. 401 crank casting numbers ....

[James Shadwick <idahoAMX@xxxxxxxxx>]

304 and 360 cranks are the same....3.44 stroke and can be 
interchanged...the balance difference is external......
390 stroke 3.574 ... 401 stroke 3.68 .. both forged
Jim
Nampa, ID

Wrambler242@xxxxxxxxxxx wrote:
> You're correct in everything except the stroke on the 390-401 crank being the same.
> If it was Greg would not be gaining 10cu.in. by using a 401crank over the 390 crank.
>
> Not, 100% sure the 304 and 360 cranks are 100% the same, IIRC they are balanced different from the factory for the larger 360 pistons?  
>
>  -------------- Original message ----------------------
> From: "Armand Eshleman" <aje1@xxxxxxxxxxxxxxx>
>   
>> Greg,
>>
>> I thought I read somewhere about clearance problems putting a 401 crank in a
>> 304. Could you please confirm that the 401 crank and rods actually fit into
>> the 304 block without interference problems?
>>
>> Gang,
>>
>> IIRC cast cranks have a very fine parting line,
>> & forged cranks have a larger wider parting line
>>
>> 304 and 360 used cast cranks, same stroke.
>>
>> 390 and 401 are forged, same stroke.
>>
>> Is this correct??
>>
>> Can any 304 crank be used for the crank in a 360?
>>
>>
>>
>> thanks,
>> Armand
>>
>>
>>
>>
>> ----- Original Message ----- 
>> From: "Greg Taylor" <amundaza@xxxxxxxxx>
>> To: "AMC-LIST" <mail@xxxxxxxxxxxx>
>> Sent: Monday, November 10, 2008 12:13 PM
>> Subject: [Amc-list] 390 vs. 401 crank casting numbers ....
>>
>>
>> Hey guys,
>> Got news that the crank for my 304 stroker may indeed be a 401 crank,
>> instead of the 390 crank ... which changes things a bit ... by +10 CID and
>> perhaps a few $$$$ for the stroker build.
>>
>> Does anyone on the list have casting numbers for the 390 and 401 cranks?
>>
>> I bought this crank from Kenedy back around 1993 or 1994 for $390, new in
>> the box with AMC bearings. It is the earlier "BW" crank, which I had the
>> adapter machined into the rear flange, for the 727 tranny. Also had it cross
>> drilled.
>>
>> Thanks for the information, guys!
>>
>>
>>
>> Sincerely,
>> Greg Taylor :) <><
>> Rochester Hills, MI
>> 1989 Jeep Grand Wagoneer "TRMN8R2"
>>
>> And the testimony is this, that God has given us eternal life, and this life
>> is in His Son. He who has the Son has the life; he who does not have the Son
>> of God does not have the life. - 1 John 5:11-12
>>
>>
>>
>>
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