The High Value engine family from General Motors is a group of cam-in-block or "overhead valve" V6 engines. They use the same 60° vee bank as the 60° V6 family they are based on, but the new bore required offsetting the bores by away from the engine centerline. These engines (aside from the LX9) are the first cam in block engines to implement variable valve timing, and won the 2006 Breakthrough Award from Popular Mechanics for this innovation. For the 2007 model year, the 3900 engine features optional displacement on demand or "Active Fuel Management" which deactivates a bank of cylinders under light load to increase highway fuel economy. It was rumored GM would produce a 3-valve design, but that never came to be. These engines were produced primarily at the GM factory in Tonawanda, New York and at the Ramos Arizpe engine plant in Mexico. The assembly line for this engine was manufactured by Hirata Corporation at their powertrain facility in Kumamoto, Japan. As of the 2012 model year, GM no longer sells these motors in any US market vehicles. 3.5 These engines should not be confused with the 3.5L DOHC LX5 (Shortstar) V6 engine. LX9 The LX9 3500 is an OHV engine based on the 3400 V6. It incorporates electronic throttle control. Bore and stroke is , for a displacement of . A GM Press Release for the 2004 Malibu described the 3500 thus: "3.5L V6, will debut in the 2004 Chevrolet Malibu. The engine offers improved performance and fuel efficiency, and runs smoother and quieter than earlier generation V6 engines. The 3500 V6 features an advanced powertrain control module, improved fuel injection system, a redesigned exhaust manifold and a new catalytic converter contribute to reduced emissions, as well as improved efficiency and performance characteristics. Improvements in cooling, sealing and the accessory drive system add to the engine's overall quality, reliability and durability." Power output ranges from to , torque ranges from to . It was used in the following vehicles and model years: 2005–2006 Buick Terraza/Chevrolet Uplander/Pontiac Montana SV6/Saturn Relay 2004–2006 Chevrolet Malibu/Chevrolet Malibu Maxx 2005–2006 Pontiac G6 Sedan / Coupe 2006–2007 Buick Rendezvous 2006 Pontiac G6 GT Convertible LZ4 The LZ4 3500 is an OHV engine that uses a similar block as the 3.9L LZ9 V6 . It was introduced for the 2006 model year Impala and Monte Carlo. Bore is the same , but the