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Originally Posted by Carnut427
Yes, cast cranks are fine for most purposes. However, when you get into a longer stroke such as 4.125 and larger, the piston has to travel a longer distance in each revolution; therefore even though two engines are turning the same RPM, the piston in the engine with the longer stroke is traveling much faster. When you reach a certain RPM, which varies by the stroke length, "normal" parts aren't good enough to take the abuse. That's when you need a stronger crank, rods, etc.
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I've honestly never heard of a cast crank failure in an FE, stroked or otherwise. It will usually be some other component or the block itself that lets go before the crank does. This all presupposes that the crank has been inspected for cracks or flaws before being installed.
This now becomes a thread about spectacular crank failures and the situations that brought them on. Let's hear the stories...