So I apologize in advance for my lack of knowledge. I pulled the heads off of my 51 Ford. One of the valves had what I am guessing to be a seal loose and hanging under the valve like a ring. I managed to tap it back into the block. I am guessing the valve was stuck and the seal popped out when I started it. It had not run since 1990. Will it be okay or do I need to replace it?