B12S1 Daewoo engine (2005 model) for Chevrolet Kalos (05–08) 1.2 (3-door hatchback, 1150cc)

The B12S1 (also known as S-TEC or LY4) is a compact 1.2-liter inline-four gasoline engine manufactured by Daewoo (now part of General Motors). It is well-known for its excellent fuel economy in small city cars and features a cast-iron engine block with an aluminum alloy cylinder head.