The B16A and B16B (single carb and twin carbs respectively) were a bored out 1583 cc development of the B14A which in turn was sired by the B4B. These engines were fitted to the PV444 in its final two years (1957 and 1958), the Volvo PV544 in its 1958 introduction, as well as the companion estate and van versions known as Volvo P445, Volvo P210, and Volvo Duett.