went boating today was running along fine then it started getting slower and slower until it was just barely pulling itself. I could tell that it lost a cylinder the way it was running. got it home and checked the plugs and they looked fine. did a compression check and the front 2 cylinders were fine but the rear two on had 25 psi. pulled the valve cover and air checked the two bad cylinders and both have bent exhaust valves. has anybody ever had this happen? if yes then what all did you end up doing? I don't know how it could have bent the valves out of the blue like that? like I said it was running fine. had good oil pressure and the tem was running fine. I dot want to pull the head and have the valves fixed if theres more problems. it is an older boat but still in good shape. all help and suggestions appreciated.