The B20 displaced 2.0 L (1986 cc/121 in³) and was produced from 1969 to 1981. It was used from 1969 to 1981 in the Volvo 120, 1800, 140, C202 and 240 series, and also in the Haubits 77 Bofors howitzer. The design is quite similar to the predecessor B18 and many parts are interchangeable.
The later B20E and B20F versions featured Bosch fuel injection (both electronic D-Jetronic and later with mechanical K-Jetronic), larger valves, and intake/exhaust ports. Output was raised to 124 hp (DIN) (92 kW) in B20E, slightly lower in B20F because of stricter emission control and lower compression. All B20 engines displace 1986 cc from 88.9 mm bore and 80 mm stroke.
Some 240 models and the C202 were offered with the "metric", eight bolt, 2.0 liter pushrod B20 motor as standard equipment.
Despite their OHV pushrod design, the engines can rev to 6,500 rpm.
Read more about this topic: Volvo B18 Engine