[1] The successor to the 1940-1956 Mack L series,[2] the B-series was a line of heavy conventional-cab trucks.

Adopting a more streamlined appearance over its predecessor, the B-series was designed with a sloped windshield and larger, rounded fenders[1] The model line was sold in multiple configurations, including tractors and straight/rigid trucks, cowled chassis (delivery body or bus), or fire trucks.

The B-series was the first Mack truck produced with a diesel engine, introducing the Mack-produced Thermodyne inline-6 in 1953.

[6] Chassis model designations: Chassis letter guide: The B Model offered 10 different gasoline engines, from a 291 cu in (4.8 L) with 107 hp (80 kW) in the B20 to a 707 cu in (11.6 L) with 232 hp (173 kW) in the B70.

The table shows the largest gasoline and diesel engines in the series.