Failed Rocker Arm

What are the cam and spring specs? That looks like a fatigue failure to me, can't really see any discoloration in the pics which would indicate overheating/lack of oil...

FWIW I ran stock Magnum rockers with a Lunati Voodoo 256/262 adv. duration cam and Hughes #1110 springs for 25k miles, never had a rocker failure or any valvetrain issues for that matter.