I am rebuilding the top end of my '83 550. I have a replacement head I got off ebay, because the original head was cracked where a bolt from the valve cover went in, and it leaked oil. I am rebuilding this replacement head and I found that both exhaust valves on the #3 cylinder are bent! I have replacement valves from the original head, so I guess I'm OK. Here is my question(s): How could this happen? How do I keep it from happening again?
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