The Valkyrie won third place in the prototype section of the 1967 New York International Sports Car Show.

[4] Don Sherman, automotive journalist and editor of Car and Driver magazine from 1985 to 1988, owned and built one in the late 1960s.

The wheelbase of the GT-X was longer than the earlier car, resulting in 4 in (102 mm) more interior length.

[11][12] As of this writing a website for Factory Fiberfab US is still up, and is advertising the Valkyrie as available or soon to be, although the site has not been updated for several years.

The factory-assembled 500 GT featured a leather-trimmed interior, a 5-speed ZF transaxle, 4 wheel Hurst/Airheart disc brakes, and a 427 cu in (7.0 L) big-block engine developing 500 hp (372.8 kW).

[13] For Valkyrie kits, the powertrain and running gear components were sourced by the car's builder, but the factory manual included suggestions.