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232 vs 258

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2drwgn View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 2drwgn Quote  Post ReplyReply Direct Link To This Post Posted: Nov/24/2015 at 8:44am
I just counted the weights on my 199 crank, and there are 6

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FSJunkie View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote FSJunkie Quote  Post ReplyReply Direct Link To This Post Posted: Nov/28/2015 at 1:46am
1965 service manual says the 199 and 232 should both have 8 counterweights.
1972 service manual says the 232 uses 8 counterweights and the 258 uses 12 counterweights.
1984 service manual says the 258 only has 4 counterweights.

So who knows. Looks like they messed with crankshaft balancing a lot through the years.


Edited by FSJunkie - Nov/28/2015 at 1:50am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Nov/28/2015 at 7:48am
Ive only seen the 70s 12 counterweight cranks and the 80s four. Starting in January 1980 (engine plant went by calendar year for most changes, not model year... makes some things hard to figure out until you know that!) the 258 went on a diet, losing somewhere around 40 pounds. Changes in castings, the crank counterweights, aluminum intake, and 7/16" vs 1/2" head bolts all contributed. The crank made up the most weight loss of a single item, but then it's the biggest casting after the block and head.
Frank Swygert
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Spin Doctor Quote  Post ReplyReply Direct Link To This Post Posted: Dec/02/2015 at 10:04am
I was working in the maintain emcee area in 818 (6 cylinder blocks, heads and V8 heads when the lightweight castings first started to come in and was assigned to the engineer overseeing the project. The first time they put one of the blocks into the broach the clamping pressure broke the casting into pieces. Once they solved that problem (putting material back into the casting and clamping pressures) the castings would break under the machining load. This was solved by casting in starts between the bearing webs that then had to be removed prior to the rest. Heads we had similar issues. So I can imagine that cranks had problems initially. Once the problems were straightened out we had people from GM, Ford and Chrysler come through to see how we had sliced the problems as they were going through the same issues
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farna Quote  Post ReplyReply Direct Link To This Post Posted: Dec/07/2015 at 7:24pm
Nice to hear that AMC taught the "big three" a thing or three over the years! Lots of R&D money doesn't always solve problems. When you absolutely HAVE to solve a problem to make a buck (and keep your job...) things get done quicker!!
Frank Swygert
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