GM has never been scared to make a large engine. Even as far back as the 1930s, they were throwing massive engines inside their production cars. While these big engines have not always equated to big numbers, the evolution is clear!
Starting back in the 1930s, Cadillac got some of the beefiest engines, with the early ones coming in V12-V16 designs. They are the only ones of their kind on this list and are also the lowest horsepower.
Some of these other GM engines reach a massive 573 cubic inches in design and up to 690lbs-ft of torque. Check them out below.
Most of these engines are post-production, with the exception of the crate engine options. However, you can still find some of these in used cars or junkyards. What would you put a massive GM engine in? Tell us on our Facebook page here!