| GM High Value engine | |
|---|---|
 2008 Chevrolet Impala 3.5L engine cover | |
| Overview | |
| Manufacturer | General Motors |
| Production | 2004–2011 |
| Layout | |
| Configuration | Naturally aspirated 60° V6 |
| Displacement |
|
| Cylinder bore |
|
| Piston stroke |
|
| Cylinder block material | Cast iron |
| Cylinder head material | Aluminum |
| Valvetrain | OHV with VVT |
| Compression ratio | 9.8:1 |
| Combustion | |
| Fuel system | Sequential multi-port fuel injection |
| Fuel type | Gasoline, E85 |
| Oil system | Wet sump |
| Cooling system | Water-cooled |
| Output | |
| Power output | 196–242 hp (146–180 kW) |
| Torque output | 213–242 lb⋅ft (289–328 N⋅m) |
| Emissions | |
| Emissions target standard | California emission standards |
| Emissions control systems | Catalytic converter |
| Chronology | |
| Predecessor | |
| Successor | GM High Feature engine |
The High Value engine family from General Motors is a group of cam-in-block or overhead valve V6 engines. These engines feature cast iron blocks and aluminum heads, and use the same 60° vee bank as the 60° V6 family they are based on, but the new 99 mm (3.90 in) bore required offsetting the bores by 1.5 mm (0.059 in) away from the engine center line. 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 featured 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 that 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.[1] The assembly line for this engine was manufactured by Hirata Corporation at its powertrain facility in Kumamoto, Japan.
As of the 2012 model year, GM no longer sells these engines in any U.S. market vehicles.