Yes we all would prefer the steel crank over the cast but how many have you seen let go ?

My first race engine was, still is, a cast crank stock LY rod engine. It's been to hell running 11.00's for years and then high 9's on the bottle over a 150 times. it has a sleeve, 7 TRW pistons and 1 Manley that was shaped with a grinder to match the others, ran a best of 9.69 @ 135. The engine is still going hard in my sons Aussie A body N/A running 11.2.

I would say that a cast crank will be fine up to 600hp.