If valves are bent you need to take a close look at the corresponding piston. Valves don't just bend. They get slapped by a piston if they float at high RPMs due to things like worn or weak springs, or if are out of time. If you don't find the cause it WILL happen again, very soon or immediately at first turn over or startup.
I remember once a fella brought a piston to me with a big hole in the dome and he asked what would cause that. I asked him where the head was. He said he pulled the heads and set them off to the side without looking at them when he tore the engine down. I told him to let me see the head. When he brought it in, the valves were mangled, half of the combustion chamber was missing as well. Head was scrap. His problem was caused by weak springs at high RPMs, the valves floated and hung there instead of following the cam duration and the piston pounded them through the combustion chamber into the runners, and that's what made the big hole through the piston dome.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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