Although it`s possible, it needs quite a bit of force to break the camshaft. It`s not ideal to let one side rise while the other side is clamped down because it generates tension, but the camshafts should withstand that amount of force. And if it breaks, you will notice it. So I think you should be ok. It`s always a good idea though to use proper tools for this job and it`s easy to make one to hold down the camshafts while doing this job.
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