Re: [AMC-list] The 232/258 puzzle

[Joe Fulton <piper_pa20@xxxxxxxxxxx>]

Thanks Frank.  As I told Mark it is a 4772 crank and it turns out it is from the 
1976 232 which was in my Gremlin.  I was hoping since it was marked 258 (The 
machine shop marked it.) that the crank fairy had left it in my parts stash.   
Turns ouf, there was not crank fairy after all.

Joe Fulton



----- Original Message ----
From: Frank Swygert <farna@xxxxxxx>
To: amc-list@xxxxxxxxxxxx
Sent: Sun, January 30, 2011 11:23:23 AM
Subject: Re: [AMC-list] The 232/258 puzzle

I have 9 232 crank casting numbers and 5 258 crank casting numbers. Send me/post 
the number from yours and I'll see if it's on the list. My list was made from 
various sources, but I still occasionally find a different number.

There are two different deck height 232s. 64-70 is short deck, 71-89 tall deck 
is about 1/8" taller. The tall deck 232 uses the 232 stroke crank and the same 
length rods as a 199. There are only two rod lengths:

'64-'71:
199 - 6.125"
232 - 5.875"

'72-'06:
232 - 6.125"
242/4.0 - 6.125"
258/4.2 - 5.875"
Piston pin height is the same on 199/232. 258 and 4.0L have different pin 
heights from the 199/232 and each other. IIRC the early and late 232 pin height 
is the same, but dish size depends on year (head chamber size and compression).

The 199 uses a flat top piston to make up for compression loss due to reduced 
stroke from the 232. 199 pistons are hard to find, but would add at least a full 
point of compression to a 232... I seem to recall someone saying it would boost 
compression to around 9.5:1.



------------
Date: Sun, 30 Jan 2011 10:00:15 -0800 (PST)
From: Joe Fulton<piper_pa20@xxxxxxxxxxx>

I have a freshly machined crankshaft which has been sitting for several years.?
The machine shop put 258 on the end but I think it was a 232 crank and I never
bothered to correct their error.? Is there a casting number I can check or how
can I, with little chance of error, measure the stroke?

I also have two 232 blocks, one freshly machined with an oversize bore (0.030 I
think).?? If the crank above is a 258 crank I assume I can use either of those
blocks (both are post-1972 motors).?? What rods will I need?? I have a 199 that
I haven't torn down yet.? Will 199 rods work with the crank above??? What
pistons?



-- Frank Swygert
Publisher, "American Motors Cars"
Magazine (AMC)
For all AMC enthusiasts
http://www.amc-mag.com
(free download available!)

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