The engine designation B4B refers to the 1400cc displacement overhead valve (also refered to as "Push-Rod") gasoline engine which powered the Volvo PV444 as introduced in 1947. It was departure for Volvo who had not produced an automobile with a four-cylinder engine in nearly 20 years. The B4B was equipped with a single down-draught carburettor and it's crankshaft rode on three main bearings. Suppliers of ancilliaries included Autolite (ignition distributors and generators), Zenith and Carter (carburettors), and Bosch (ignition distributors, generators and starter motors.