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

[Glen Hoag <hoag@xxxxxx>]

Stroke   Engines
3.25"     250, 327, 327 (GEN-1)
3.28"     290, 343 (GEN-2)
3.44"     304, 360 (GEN-3)
3.574"   390
3.68"     401

Rotating assembly balance was achieved externally by use of different 
crank pulleys and flywheels or flexplates.  I would have to look in 
my parts catalog, but I think the cranks are the same between 290/343 
and 304/360.

--Glen

At 08:57 AM 11/11/2008, Mark Price <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?
>
>
>
>--
>Mark Price
>Morgantown, WV
>1969 AMC Rambler, 4.0L, EFI, T-5
>2004 Grand Cherokee Laredo, 4.7L, Quadratrac II
>" I realize that death is inevitable.
>I just don't want to be around when it happens! "
>
>  -------------- 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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