indy rocker arms

do anyone have problems breaking indy rocker arms and bending push tube,i just broke one last night but this gas been a constant problem,i have them shimed right,ihave problems and bending push tubes,this one happen after i got my time slip and was returning to the trailer then it let go just after a 9.18 pass,there about 7 yeras old,also trying to get info out of indy heads is like talking to the wall,i have 440-1 heads,there cam which is a 680 lift roller,they told me to set the valves cold at 10-12,hot,24-26,anyone one else run into this