Volvo Redblock Engine  From Wikipedia, the free encyclopedia
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B234F Red Block in a 740 GLE  The Volvo B21 was a slant
straight-4 engine first used in the Volvo 200 series, meant to
replace the B20. The B21 and all derived engines are often
referred to as red block engines for the red paint applied to
the block. The primary differences when compared to the B20 was
the switch to a SOHC in place of the older pushrod
configuration, and an aluminum crossflow cylinder head versus
the iron head of the B20.   Initially the overhead camshaft
versions were offered as optional equipment on the 240, becoming
standard in all markets by the 1976 model year. The overhead
camshaft motors were available in displacements of 2.0 (B19 and
B200), 2.1 (B21), and eventually 2.3 (B23 and B230) litres. The
B21 featured an 80 mm (3.1 in) stroke, and 92 mm (3.6 in) bore.
In the US, the B21's power output ranged anywhere between 98 hp
(73 kW) and 107 hp (73 to 80 kW), based