Input (grade 13): The Offenhausers won five straight victories at Indianapolis from 1971 to 1976, and it was not until 1981 that they were eliminated as competitors by engines such as the Cosworth V8 engine.
Output (grade 8): The Offenhauser engines won five straight races at Indianapolis from 1971 to 1976. It was not until 1981 that engines such as the Cosworth V8 engine eliminated them.