The Pontiac GTO was born at GM's Milford Proving Grounds when John DeLorean and a group of engineers gathered to test a prototype 1964 Pontiac Tempest that had been stuffed with a 389 cubic-inch V8.

The 1966 GTO is arguably the most recognizable and successful icon of the original muscle car era, a machine that dominated street culture and the sales charts in equal measure. While many collectors ...