Those forged cranks are beefy for sure, but they were also internally balanced whereas (I believe) the light duty FE blocks were externally balanced. That, combined with the fact that these were med/heavy duty engines and that explains the extra 20 Lbs. The balancers on the light duty were typically much bigger and heavier and the flywheels were weighted as well. In the end, I don't know if it saved anything sticking with the iron crank. 
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Mon, December 28th, 2020, 10:50 AM
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