The 1967 Shelby GT500 was already a beast of a muscle car, but someone clearly thought, “Why not make it even more ferocious?” Enter the 427 “side-oiler” V8—a name that sounds like it should come with its own action movie. This engine upgrade turned the GT500 into the automotive equivalent of giving a lion a jetpack. Shelby had already set the bar high with previous models, but the 427 side-oiler GT500 is like the muscle-bound superhero who skips leg day and goes straight to saving the world.
