the most powerful Cadillac sedan in history. Cadillac 4.2 liter twin-turbo V-8 LTA engine The 4.2 liter V8 engine (GM RPO code LTA) is an eight-cylinder, dual overhead cam (DOHC) twin turbo engine produced by General Motors specifically for use in Cadillac luxury vehicles. The engine is the result of a new clean-sheet engine design as well as Cadillac's first twin-turbo V-8 engine. It first launched on the 2019 Cadillac CT6. See also Cadillac V16 engine (used during the 1930s) From the 1950s through the 1970s, each GM division had its own V8 engine family. Some were shared among other divisions, but each respective design was engineered and developed by its own division: Buick V8 engine GMC V8 engine Chevrolet small-block engine Chevrolet big-block engine Oldsmobile V8 engine Pontiac V8 engine Holden V8 engine GM later standardized on the later generations of the Chevrolet design: General Motors small-block engine List of GM engines References V8 V8 engines