On July 3, 2020, about 1215 central daylight time, a Champion 7EC airplane, N9891B, was substantially damaged when it was involved in an accident near Port O'Connor, Texas. The pilot and passenger were not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. According to the pilot, after adding fuel to the airplane, he departed from the Calhoun County Airport (KPKV) and flew along the coastline. About 15 minutes into the flight, the engine lost power. He established best glide airspeed and turned the airplane towards land. The airplane would not hold altitude and impacted terrain and brush about 400 yards from the coastline. A small post-crash fire developed in the engine compartment; substantial damaged was noted to the wing struts and bottom fuselage. Damage was also found on the main landing gear and propeller. The wreckage was recovered to a hangar and an engine examination was conducted. The examination found that the No. 3 intake valve was stuck in the open position. A reason for the stuck valve was not identified. It was also noted that the valve springs on all the cylinders were weak; however, it could not be determined if this was due to heat from the post-crash engine compartment fire. No other pre-impact abnormalities were found.