i think its blowed

ok so i was racing this black coupe mustang the other night and when i let out of it i realized the ole scampy was clattering like crazy so my reflexes shot my eyes directly to my oil pressure guage and sure enough ....ZERO... so i towed it home and uppon further inspection i had broken an intake rocker arm on the right bank so i pulled the shaft and looked down into the lifter valley and noticed my lifter for that same valve is missing in action so heres my question is that common? should i replace all my lifters since they were pumped dry? and finally i have broken many stock rockers why does this keep happining(first time for the lifter prob though)