Help

Help got a 02 edge xcsp 800 and I am doing the exhaust valve gaskets on it so I pulled the valve off and one valve will not come out of the block looked in side it's not contacting anywhere and the piston has no damage on it but I think there is a problem with the valve and it will not come out and I'm afraid of wrenching on the damn thing to get it out any help would be great

Help