For the serious Impala enthusiasts, Chevrolet introduced a new engine in mid 1963, the Z-11. This was a 427 V8 loosely based on the existing 409 but featured a smaller bore and a longer stroke. It featured angled valves and was nicknamed the "porcupine head motor." Although it was officially rated at 430 bhp, it easily made close to 500 bhp and was an instant success at the drag strip. Unfortunately, it was only available to a select few of factory approved customers through Chevrolet's RPO (Regular Production Option). 

Now fast-forward 44 years and we witness the introduction of the LS7; the biggest, baddest small-block ever built by GM.  What takes place next is a rebirth of the’63 RPO Impala with a modern twist.  A concept where today’s horsepower and torque from a charged LS7 backed by a 6-speed manual transmission with 4.10 gears fuse with the agility of a custom C5 Corvette suspension while maintaining the classic lines of the ’63 Impala to create a pro-touring dream.