I am in the process of building my motor and when reassembling it i noticed that one of the three caps that go over the cams is missing now. Honda says its not a part I can order unless i purchase the whole cylinder head. and so i called this engine place in town and they said if i did find one that I would have to have the head line bored because one from a different head would be a different size or something. is this true? has anyone ever damaged or lost one of these? where can you find one? what if any work did you need to do to replace it? I need help. what do you guys think i should do.