**600hp sbm block limit? Or is it bs!!**

I can speak to one high-HP late model magnum block and crank. These both have seen solid 850HP via single blow-thru turbo. (9.5x @ 3700lbs) Alas only a few times at that power level but a know a good number of runs at 7-750. It's melted a few pistons in it's time but the block and crank are still good.