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

[Wrambler242@xxxxxxxxxxx]

I forgot about the ability to clear up the balance with dampers and flywheels.
Silly me...

--
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>
> Thanks Greg and Mark,
> 
> Yeah, now that I think about it, that makes sense, there would need to be
> something done differently to balance the two (304 vs. 360) but isn't that
> done on the flywheel, vibration dampener?
> I have two 360s and two 304s, I never checked to see if there is more metal
> removed from the counterweights on the 304 crank versus a 360 crank. I
> remember taking a 70 360 crank from an Ambassador to the machine shop to
> have the long time searched for 304 flywheel match balanced to the 304 flex
> plate from the white 70 Javelin. I took a 304 piston and rod assembly with
> rings from a 79 304 and the 70 360 crank. I also gave the machinist the 304
> dampener off the 304 in the white 70 Javelin. When it all came back home,
> the 70 360 crank had a little more material removed from one counterweight.
> Does that seem unusual? Whatever the machinist did, he did correctly. The
> engine doesn't vibrate at idle, nor at higher rpm either.
> 
> Armand
> 
> 
> ----- Original Message ----- 
> From: <Wrambler242@xxxxxxxxxxx>
> To: "AMC/Rambler owners, drivers and fans." <amc-list@xxxxxxxxxxxx>
> Sent: Tuesday, November 11, 2008 8:57 AM
> Subject: Re: [Amc-list] 390 vs. 401 crank casting numbers ....
> 
> 
> > 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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