GMC's huge Twin Six V12 gas engine was made to take on its diesel counterparts, powering fire trucks and farm machines, but it didn't stay on the market long.

Engine Introduced in the 2011 Mustang S197 II, the 3.7-liter Cyclone V6 (also known as the Duratec 37) featured ...

The base Grand Am SE has a 2.4-liter twin-cam four-cylinder engine with 150 ... swaps the four-cylinder for a burlier 3.4-liter V6 engine with 170 horsepower. Read more: The 20 Best BMWs Ever ...