I recently noticed that I was losing about 180 RPMS when throttle was wide open on my merc 496 with 475 hours. Long story short had my mechanic come down and he did a compression check and said that I had a valve that was sticking . He is recommended redoing the head . Is there any chance this problem will just work itself out over time ? From what I’ve heard a lot of motors start up in the spring time with valves sticking and after The motor warms up it’s fine .