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    Just found this When the 351W engine was...

    Just found this
    When the 351W engine was upgraded to a onepiece rear main seal in 1985, its revised nodular iron crankshaft received a revised “7M” identification code. Later in production, it...
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    Well I thought that, but I am sure I read...

    Well I thought that, but I am sure I read somewhere late 351w cranks were cast heavier, for less flex, at 50oz. Can I find where I read it, of which revision of the crank. 6M 7M 7MA... Why did they...
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    351w 7M crank balance, 50oz?

    Anyone know if the 7M 351w crank is balanced at 50oz rather than 28oz?
    Google is not providing an answer.
    Engine came as several boxes of bits, but balancer looks like 50oz type. Trying to figure...
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