No it isn't. If they're bending you've got some sort of interference happening. Valve spring bind at full lift, retainer to valve guide at lift, valve to piston, etc. Something's happening and you need to do some investigating.
Hopefully not, I would say the odds are in your favor the cam is okay. You're going to have to remove the heads anyway to machine the guides. Before you do anything I'd remove a spring or two and check to make sure the retainers are the problem before you tear into it (unless you can see that they are hitting with the springs on the heads).
[This message has been edited by Camcojb (edited 06-13-2002).]