# Mack B series > Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Mack_B_series > Markdown URL: https://mediated.wiki/source/Mack_B_series.md > Source: https://en.wikipedia.org/wiki/Mack_B_series > Source revision: 1355904989 > License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) Motor vehicle Mack B-series 1961 Mack B-series fire truck Overview Manufacturer Mack Trucks Production 1953-1966 Body and chassis Class Truck Body style Truck (bonneted cab) Tractor Straight/rigid truck Cowled chassis School bus Fire truck Multi-stop truck Powertrain Engine 6.8 L Magnadyne I6 (112 kW) (petrol) 8.4 L I6 (103 kW) (diesel) 11.0 L Thermodyne I6 (139 kW) (diesel) 11.0 L Thermodyne I6 T (164 kW) (diesel) 11.6 L Thermodyne I6 (157 kW) (diesel) 14.0 L Cummins NTC I6 T (250 kW) (diesel) 14.2 L Thermodyne V8 (190 kW) (diesel) Transmission Mack 10-speed duplex (5-speed, 2-speed auxiliary) Mack 15-speed triplex (5-speed, 3-speed auxiliary) Mack 20-speed quadruplex (5-speed, 4-speed auxiliary) Chronology Predecessor Mack L-series Successor Mack R-series B Model Mixer The **Mack B series** is a model line of trucks produced by [Mack Trucks](/source/Mack_Trucks) between 1953 and 1966.[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. During 1966, Mack replaced the B-series with the [Mack R-series](/source/Mack_R_series), which lasted into the 21st century.[3][4][5] In total, 126,745 examples of the B-series were produced over 13 years.[6][7] ## Model numbers & letters **Chassis model designations:** - B1x - - B2x - - B3x - - B4x - - B5x - - B6x - - B7x - - B8x - - B9x - **Chassis letter guide:** - B - school bus chassis - C - flat face cowl for the addition of a delivery body - E - built for export - F - fire truck chassis - L - light weight or weight reduced by using aluminum components - P - platform chassis (single axle straight truck) - R - right hand drive. This designation was started in 1964 but right hand drive available - S - six wheel chassis (tandem axle) - T - tractor chassis - X - severe or extreme service chassis Mack B81 (the heaviest duty range) dump truck ## Engines 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. A wide range of diesels were also offered. From the B61 up to the ENDT 673 turbocharged I6 and END 864 V8 were offered. From the B73 up to the Cummins 855 cu in (14.0 L) I6s up to the NTC335 were available. The table shows the largest gasoline and diesel engines in the series. Model Engine Displacement Type Horsepower Torque B20 EN291 291 cu in (4.8 L) G I6 107 hp (80 kW) at 2800 232 lbf⋅ft (315 N⋅m) at 1400 B30 EN331 331 cu in (5.4 L) G I6 122 hp (91 kW) at 2800 264 lbf⋅ft (358 N⋅m) at 1400 B4X EN414 413 cu in (6.8 L) G V8 214 hp (160 kW) at 4000 END673 672 cu in (11.0 L) D I6 B53 END673 B6X EN540 540 cu in (8.8 L) G I6 185 hp (138 kW) at 2400 445 lbf⋅ft (603 N⋅m) at 1300 ENDT673 672 cu in (11.0 L) TD I6 END864 864 cu in (14.2 L) D V8 B7X EN707 707 cu in (11.6 L) G I6 205 hp (153 kW) at 2100 615 lbf⋅ft (834 N⋅m) at 1200 NTC335 855 cu in (14.0 L) TD I6 335 hp (250 kW) at 2100 B8X EN707 NTC335 (Type: G=gasoline, D=diesel, TD=turbocharged diesel)[8] ## See also - [Mack Trucks](/source/Mack_Trucks) - [List of Mack Trucks Products](/source/List_of_Mack_Trucks_Products) ## References 1. ^ [***a***](#cite_ref-:0_1-0) [***b***](#cite_ref-:0_1-1) [Corporate History: 1950-1959](http://www.macktrucks.com/default.aspx?pageid=259) - Mack Trucks.com 1. **[^](#cite_ref-2)** ["Mack Trucks "YEARS""](https://www.macktruckshistoricalmuseum.org/mack-history/1950-1959/). *www.macktruckshistoricalmuseum.org*. Retrieved 2020-07-27. 1. **[^](#cite_ref-3)** [Corporate History: 1960-1969](http://www.macktrucks.com/default.aspx?pageid=260) - Mack Trucks.com 1. **[^](#cite_ref-4)** ["Mack Trucks "YEARS""](https://www.macktruckshistoricalmuseum.org/mack-history/1960-1969/). *www.macktruckshistoricalmuseum.org*. Retrieved 2020-07-27. 1. **[^](#cite_ref-5)** Warth, Thomas E. (1998). *Mack Trucks Photo Gallery*. Iconografix. pp. 151–164, 164–165, 167–168, 170–177, 179–185, 188, 195, 197, 204–207. [ISBN](/source/ISBN_(identifier)) [1-882256-88-3](https://en.wikipedia.org/wiki/Special:BookSources/1-882256-88-3). 1. **[^](#cite_ref-6)** ["Model Production Numbers (1905-2000)"](https://www.macktruckshistoricalmuseum.org/-/media/files/museum/model-production-numbers-1905-2000.pdf) (PDF). *Mack Trucks Historical Museum*. Retrieved July 27, 2020. 1. **[^](#cite_ref-7)** ["Model Production Numbers Model B"](http://www.tyldenheritage.com.au/uploads/9/3/0/6/9306704/bmodelid.pdf) (PDF). *tyldenheritage*. Retrieved May 24, 2026. 1. **[^](#cite_ref-8)** Forier, Louis C., ed. (1973). *Motor's Truck & Diesel Repair Manual* (26 ed.). Motor. pp. 1003–1004, 1107–1109, 1250. [ISBN](/source/ISBN_(identifier)) [0-910992-16-9](https://en.wikipedia.org/wiki/Special:BookSources/0-910992-16-9). ## External links Wikimedia Commons has media related to [Mack B-Series](https://commons.wikimedia.org/wiki/Category:Mack_B-Series). - [Antique Mack truck forum](http://www.bigmacktrucks.com) - Site specializing in B model information v t e Mack Trucks In production Anthem Granite LR MD Pinnacle Pioneer Keystone Super-Liner TerraPro Titan Trident Discontinued AC series B series CH series EH series F series L series M123/M125 series Magnum MC/MR series Metro-Liner NM Series NO Series R series This truck-related article is a stub. You can help Wikipedia by adding missing information. - [v](https://en.wikipedia.org/wiki/Template:Truck-stub) - [t](/source/Template_talk%3ATruck-stub) - [e](https://en.wikipedia.org/wiki/Special:EditPage/Template:Truck-stub) --- Adapted from the Wikipedia article [Mack B series](https://en.wikipedia.org/wiki/Mack_B_series) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Mack_B_series?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.