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Sure sounds like a valve. It's in the right place, too. Are you using MMO in the gas and/or oil? If not, try adding it to both. I believe it prevents sticky valves. I always have used it in gas and oil, and have never had to open the valve cover in 20 years. If oil level is unchanged, maybe oil pressure decreased as engine and oil got warmer. Others will be along with more knowledge. This might be a good time to check your compression.
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