As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE LOST POWER ON TAKEOFF ROLL AND TAKE OFF WAS SAFELY ABORTED. FOUND NO COMPRESSION ON CYLINDER #6 AND DETERMINED THE ENTIRE INTAKE VALVE WAS MISSING. FOUND VALVE IN THREE PIECES IN INTAKE PLENUM. VALVE STEM TIP HAD SEPARATED FROM THE VALVE STEM AT THE KEEPER GROOVE AND WAS STILL IN THE ROTATOR CAP. LIFTER, PUSH ROD ENDS, ROCKER, VALVE SPRING RETAINER AND KEEPERS WERE STILL IN PLACE AND UNREMARKABLE. PARTS SENT TO LYCOMING FOR EVALUATION.