The valvetrain consists of chain-driven hollowcast dual overhead camshafts (DOHC) that actuate 4-valves per cylinder via roller finger followers with hydraulic tappets.

The Family 0 engines were produced by Opel Wien in Vienna/Aspern (Austria), by GM in Bupyeong (Korea) and Flint (Michigan, USA).

It is an updated version of the Family 0 engine and features TwinPort technology – twin intake ports with a choke closing one of the ports at low RPM, providing strong air swirl pattern for higher torque levels and better fuel economy.

Applications: The EcoFlex engine is a version of the TwinPort tuned to provide better fuel economy and lower emissions.

For model year 2012, the EcoFlex engines have been updated with double cam phasing (DCVCP) in a Gen III block.