GM High Feature engine

The GM High Feature engine, also known as the HFV6 and including the 3600 LY7 and its derivative the LP1, is a family of modern DOHC V6 engines made by General Motors. It was introduced in 2004 with the Cadillac CTS and the Holden VZ Commodore. It is a 60 degree, 24 valve design with an aluminum block and heads and sequential multi-port fuel injection, and most versions have continuously variable cam phasing on both intake and exhaust valves, electronic throttle control, a variable-length intake manifold and coil-on-plug ignition. The international team that built the Ecotec developed it, including the Opel engineers behind the 54 degree V6, with design involvement from Ricardo. Holden and Cadillac ran the program jointly, with design work in Detroit, and Holden built its version under the name Alloytec. The 2.8 litre LP1 arrived in the 2005 Cadillac CTS and the turbocharged LP9 went into Saab cars.