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Can I run a "3M" crank in a '74 351W block? From what I understand, the 3M cranks were used up until '72, and then the 3MA crank was used until '83, but the specs on both cranks appear to be the same--is there a difference?
 

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all 351W oem cranks can be used , some may need oil slinger mod for later model block
 

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Yes. 3C, 3M, 3MA, 7M and 7MA are all interchangeable two-piece seal 351W cranks.

David
 
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