Maserati 6-cylinder engine
Maserati made two naturally-aspirated, straight-6, racing engines, designed for Formula One; between  and . The first engine was the 2.0-liter A6G; in accordance with the engine regulations imposed by the FIA. Their second and last engine was the 250 F1; in accordance with the engine regulations imposed by the FIA for . Several of these engines, or derivatives of these engines, were also used in various Maserati sports cars. Maserati A6GCM engine
The inline 6-cylinder two-liter engine with DOHC and 12 valves, 3 two-barrel (twin choke) Weber carburetors delivered  to . It was developed by Alberto Massimino and Vittorio Bellentani. Initially with a  capacity (, with a compression ratio of 13.5 :1) delivering , in 1951 and 1952
 Then  capacity (, with a compression ratio of 13.5 :1, with twin ignition) delivering , in late 1952
 And finally with a  capacity , with a compression ratio of 12 :1, with twin ignition) delivering , in 1953. The engine was mated to a 4-speed gearbox. Maserati 250 F1 engine
The 250F principally used the SSG 220 bhp (@ 7400 rpm) 2.5-litre Maserati A6 straight-six engine. Maserati 300S sports car engine
The 3.0-liter (approx  at 6200 rpm) engine used in the Maserati 300S was based on the Straight-6 design of the Maserati 250F and incorporated a lengthened stroke developed by Vittorio Bellentani to increase the capacity from the original 2.5-litres. The compression ratio was reduced from 12:1 to 9.5:1, partly due to the FIA regulations requiring the engine to be run on road car fuel. It used three Weber carburetors. Applications

Formula 1 cars
Maserati A6GCM
Maserati 250F

Sports cars
Maserati 300S

References 

Maserati
Formula One engines
Gasoline engines by model
Straight-four engines