High Quality Content by WIKIPEDIA articles! The all alloy Alfa Romeo Twin Cam engine series was an inline-4 cylinder engine produced by Alfa Romeo from 1954 to 1994. For earlier Alfa Romeo engines featuring twin camshafts, refer to the main Alfa Romeo page. For the later 8 or 16-valve Twin Spark engines which also feature twin camshafts, please refer to the Alfa Romeo Twin Spark engine page.