The GM Alloytec V6 was a major leap forward from the Ecotec, introducing an all-new aluminium engine platform packed with modern technology including dual overhead camshafts, continuously variable valve timing and electronic throttle control. Below is a closer look at what makes the Alloytec one of GM's most advanced naturally aspirated V6 engines. The GM Alloytec V6 – Cylinder Block, Valvetrain & Fuel System The Alloytec V6 is part of GM's global High Feature V6 (HFV6) engin