High Quality Content by WIKIPEDIA articles! The Family II is a straight-4 piston engine that was originally developed by Opel in the early 1970s. It was used in the Opel Ascona and Opel Kadett and their corresponding sister models the Vauxhall Cavalier and Vauxhall Astra. In the US the SOHC engine was available from 1982 to 1990 including a turbocharged version known as LT3.