(By Greg Rourke) – One never knows what might be lurking in an average suburban garage. Case in point: One ultra rare Buick GS Stage 2.
Most of us are aware of the Stage 1 Gran Sports. Some reports claim they are third fastest of the first muscle car era, running 13.4’s in the quarter. The first two were the 427 Cobra and 1966 427 Corvette, but some might feel they are sports cars, not muscle cars. In any case, Buick engineers decided this wasn’t enough. They developed Stage 2 parts in 1969, initially consisting of a cam, high compression pistons, Kustom brand headers, intake and carburetor, and rear gears but no cylinder heads. The cam was matched to the more restrictive exhaust ports of the standard heads. Keep in mind GM brass still imposed a 400 cubic inch limit on their midsize cars. This just wouldn’t do, so the Stage 2 heads were made available for the 455 in 1970. For some reason they kept the cam designed for the 400 with the old heads, strange but true. They didn’t bother to make exhaust manifolds to fit these heads, you had to buy the Kustom brand 2 1/8″ headers. Early testing showed with just a set of slicks 10.70s at 123 were possible.