High Quality Content by WIKIPEDIA articles! The Holden straight-six motor is a straight-six engine produced by General Motors–Holden`s in Australia between 1948 and 1986. Initially dubbed the Grey motor alluding to the colour of the cylinder block, later iterations came in the form of a Red, Blue, Black and the four-cylinder Starfire engine. These engines were fitted to all Australian-designed Holdens of the same years, and the four-cylinder Starfire notably found its way into the Toyota Corona (XT130). The grey motor is a different engine to the latter ones. The Red, Blue, Black and even the Starfire are all inter-related with many common parts and castings.