GM High Value engine

The High Value engine family from General Motors is a group of Cam in Block or "Pushrod" V6 engines. They use the same 60° vee bank as the 60° V6 family they are based on, but the new 99 mm (3.9 in) bore required offsetting the bores by 1.5 mm (0.1 in) 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 model year 2007 the 3900 engine features optional displacement on demand, or what is now called "Active Fuel Management" which can deactivate one bank of cylinders under light load to increase economy. It was rumored GM would produce a 3-valve design, but never came to be. These engines are produced primarily at the GM UAW factory in Tonawanda, New York.