human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: engine model, engine displacement, valvetrain, max. power : kW ( PS ), rpm for max. power, max. torque : Nm ( ft·lbf ), rpm for max. torque
###Question: What is the valvetrain with an engine model that is engine model?
gpt
SELECT valvetrain FROM table WHERE engine model = engine model