440 head noise. Perpetual problems. Problem solved

Found the problem. Turns out it was in the valve train. I didn't know it but there's actually an smaller spring inside the big spring on the valve and that inside spring is broken. Right in the middle of the head were the noise was coming from. Now I need to figure out what it's going to take to fix it. Thanks to the everyone for there help!

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DOH! :D
Glad you found it.
Still can't figure out what the bell sound could be coming from.