Just too add a little to the conversation, the stock original GM supplied push rods were solid type push rods and somewhat prone to bending. The after market replacements from sealed power, TRW and others are tube type push rods and are significantly stronger and thus less prone to bending. So if you bent a push rod, for whatever reason, replace them all with after market. Its one of those instances in which the after market parts are actually better then GM.
