Re: [Amc-list] AMC six, crankshaft bolt pattern?

[Frank Swygert <farna@xxxxxxx>]

I know for sure that GEN-2/3 V-8s use the same flywheel bolt pattern as the six, so the GEN-1 V-8 will swap also. Again, diameter is important for meshing with the starter and fitting under the bell. The late six (72+) flywheel is the same as GEN-2/3 V-8s, but remember that the V-8s are balanced with a counterweight on the flywheel, the six flywheel is neutral balanced. Don't know about the diameter of the GEN-1 V-8 flywheel. 

The "cone" on the rear of the crankshaft is only for early model automatics. All the Dual Range Hydramatics have it. I'm not sure if any of the BW trannys did, but if your crank is a 58 the early ones had to. I know that by 62 all the crank flanges were flat and would take either manual or auto trans. I suspect only 58-59 had the different crankshaft, but can't say for sure. 

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Date: Tue, 22 Apr 2008 21:33:12 -0700 (PDT)
From: Tom Jennings <tomj@xxxxxxx>

On Tue, 22 Apr 2008, Greg Taylor wrote:
> FWIW, the Gen I V8 pattern matches the Gen 2/3, but I think the centering flange was a little different diameter.  Bolt holes were the same, though. Perhaps the early sixes have the Gen I flange size, too.


Interesting. I've never been in a position to compare 6 vs. 8
crank butt patterns. I'm not sure what utility there would be
in being able to swap 6 and 8 parts, but 72-up could benefit
some. Big clutches for hot sixes?

I did unfortunately, not recall before buying that there IS
a difference in early six (195.6) crankshaft butts -- auto
vs. manual have different flanges.  The '58 short block I bought
has apparantly an automatic flange, with a protruding 'nose'
with the center bushing in it. If I recall, the manual flange
is flush across the back, with a recess for the pilot bushing.

-- 
Frank Swygert
Publisher, "American Motors Cars" 
Magazine (AMC)
For all AMC enthusiasts
http://farna.home.att.net/AMC.html
(free download available!)

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