Alfa Romeo Twin Cam engine

The Alfa Romeo Twin Cam engine is an all-alloy inline-four engine series produced by Alfa Romeo from 1954 to 1994. In Italian it is known as the "bialbero", and has also been nicknamed the "Nord" (North) engine in reference to its being built in Milan in the North of Italy and to distinguish it from the Alfa Romeo Boxer engine built in the South (Sud) for the Alfasud.