They're sort of snug anyway, but it's probably just tight in the bearings.
Make sure you still have the timing gear on the front so you have some leverage.
You're most likely at the point where each cam bearing journal is starting into the next bearing and they're not quite lined up straight.
The timing gear gives you some leverage on the cam. You can also use a coat hanger to support the back end of the camshaft and it might come out easier.
You hardly ever have this problem is the engine is sitting on its' backside and you are lifting the cam straight up and out.
Good luck!
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