user: Question: What is the valvetrain with an engine model that is engine model?
Columns: ['engine model', 'engine displacement', 'valvetrain', 'max. power : kW ( PS )', 'rpm for max. power', 'max. torque : Nm ( ft·lbf )', 'rpm for max. torque']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1.4 SD', 'cc ( cuin )', '8v SOHC', '35 (48)', '4,500', '82 (60)', '2,700 - 3,500']
SQL:

assistant: SELECT "valvetrain" FROM "Table" WHERE "engine model" = 'engine model';