High Quality Content by WIKIPEDIA articles! 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 were the switch to a single overhead cam (SOHC) in place of the older pushrod configuration, and an aluminum crossflow cylinder head versus the iron head of the B20.

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