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

[Joe Fulton <piper_pa20@xxxxxxxxxxx>]

While the strokes might be the same, the rear face is different depending upon whether the crank is a pre-72 or 72 and later crank.  

I have the following cranks on my parts room floor

1970 304 crank   Number 3195262
1972-later 360   Number 3214274

Joe Fulton


--- On Tue, 11/11/08, James Shadwick <idahoAMX@xxxxxxxxx> wrote:

> From: James Shadwick <idahoAMX@xxxxxxxxx>
> Subject: Re: [Amc-list] 390 vs. 401 crank casting numbers ....
> To: "AMC/Rambler owners, drivers and fans." <amc-list@xxxxxxxxxxxx>
> Date: Tuesday, November 11, 2008, 7:33 AM
> 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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