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The Toyota NZ engine family is a straight-4 piston engine series. The 1NZ series uses aluminum engine blocks and DOHC cylinder heads. It also uses sequential fuel injection, and has 4 valves per cylinder with VVT-i. The engines are produced by Toyota's Kamigo Plant in Toyota, Aichi, Japan (for Prius, Vitz, ist and Sienta); by Siam Toyota Manufacturing in Chonburi, Thailand (1NZ for Yaris and Vios); and by Indus Motor Company in Karachi, Pakistan (2NZ for Corolla).