Alfa Romeo Boxer engine
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The Alfa Romeo Boxer engine was a water-cooled flat-4 piston engine developed by Alfa Romeo for front-wheel drive, longitudinal applications.
It debuted on the Alfasud, which was introduced in 1971 at the Turin Motor Show. Wikipedia
Cooling system: Water-cooled
Cylinder block material: Cast iron
Cylinder bore: 80 mm (3.15 in); 84 mm (3.31 in); 87 mm (3.43 in)
Cylinder head material: Aluminium alloy
Fuel system: 1 or 2 carburetors; Fuel injection
Oil system: 4–4.5 L (4.2–4.8 US qt; 3.5–4.0 imp qt)
Piston stroke: 59 mm (2.32 in); 64 mm (2.52 in); 67.2 mm (2.65 in); 72 mm (2.83 in)