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 - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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