is narrowed and the included angle between the valves is down to 46°. The Twin Spark engine in the 75 also employed Alfa's variatore di fase VVT system which, when combined with electronic fuel injection, gave a power output of . The last examples of the Alfa Twin Cam were the , and 8V Twin Spark engines featured in the 155 and 164. After 1995 the 155 featured the 16-valve Twin Spark which, although sharing features with the previous engine, is a different design that is a member of Fiat's "Pratola Serra" engine series, while the 164 continued with the 8-valve Twin Spark until the end of production in 1997. The production of the Alfa Romeo Twin Cam ended in 1997, by which time it had been gradually replaced since 1995 by the newer Fiat-based 16-valve Twin Spark engines. Production sizes and applications See also Alfa Romeo V6 engine Fiat Twin Cam engine References Further reading Twin Cam Straight-four engines Gasoline engines by model