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Camshafts are hardened, therefore brittle and will snap before they bend.
The cam has to push the valves open, overcoming the springs, for those lobes that are pointing downward.
You'll need to get creative with a prybar on one of studs on the side of the head putting a nut on it and levering down on the cam between lobes.
A helper would make it easier while one person levers the cam down while the other puts the nuts on the caps.
You could also start tightening the nuts on some of the caps which should draw the cam downward enough to get nuts started on the other caps.
As mentioned, the cam is brittle, so go slow and easy.
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