I've been rolling around the idea of possibly stroking my '06 GT, and if not, at least strengthening my rotating assembly. I'm sitting on around 425 hp NA and would like to eventually supercharge or spray it as well as increase engine speed to around 7500 RPM. Either choice would include H - beam rods, the lightest, reasonably priced forged pistons I can find, and upgraded rings, but I haven't figured out if I need a forged or cast crank. Something I've considered is a cast Scat 9000 series crank, or something similar. Has anyone had any long term experience running an aftermarket cast crank on a stock blocked, 550-650 hp engine?