What is the biggest engine that general motors has ever made?

The GM V16 was a 16-cylinder internal combustion engine produced by General Motors from 1926 to 1937. It was the largest and most powerful engine produced by General Motors in the early 20th century.

The V16 engine was designed by GM engineer Charles F. Kettering and his team. It was produced in two variants: a 45-degree V16 and a 90-degree V16. The 45-degree V16 had a displacement of 7.4 litres (455 cu in) and produced 185 horsepower (138 kW) at 3,200 rpm. The 90-degree V16 had a displacement of 8.5 litres (525 cu in) and produced 275 horsepower (205 kW) at 3,600 rpm.

The GM V16 was used in several luxury cars, including the Cadillac V-16, the LaSalle Series 400, and the Buick Limited Series 90. The V16 engine was also used in several racing cars, including the Duesenberg Model J and the Stutz Blackhawk.

The production of the GM V16 engine ended in 1937. It was replaced by the Cadillac V8 engine, which was more efficient and powerful.