So far I've only found (thanks to those that have linked me) basic or general info regarding these motors. I'm looking for definitive answers regarding block/crank/rod/rod bolt strength (not just that they're upgraded, but how much power they can take, what material is the crank made of, is it fully counterweighted, what size journals, etc.), and valvetrain components (how much rpm/lift can the stock valvesprings take before coil bind or floating the valves?)
I believe Black SRT8 said that 6.1s make power up to 6800rpm, what's the limiting factor (weak link) for not going there all the time? Can anyone link me to a dyno graph with rpm scaling?
Any and all such info would be greatly appreciated.

Thanks