user: Question: What engine did the Porsche 718 chassis use?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Points']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1953.0, 'Rennkollektiv EMW', 'EMW', 'EMW Straight-6', 0.0]
SQL:

assistant: SELECT "Engine" FROM "Table" WHERE "Chassis" = 'Porsche 718';