Overreving it during burnouts. That causes parts to break - not bad luck. If everyone drove their cars like grandma all the time and had valve springs, rings, and other engine parts go bad then it is either bad luck or a manufacturing issue. When you do "massive burnouts" you make your own "luck". You are lucky if you do not break anything.
Don't get me wrong - I'm not here to chastise the OP for his choices and driving style but its not luck. All i'm saying is if they are going to have the motor out - upgrade when its out and save some labor. Build it to take "Massive Burnouts". Get over your self frank, its not your problem....peace out