In 1972 Green was responsible for the media controversy, known as the 'Supercar scare', which ended the Ford XA Falcon GT-HO Phase IV, the Holden LJ Torana GTR XU-1 V8, and the rumored Valiant VH Charger fitted with a Chrysler V8 engine (former Chrysler Australia executives and their test driver, leading racer Leo Geoghegan, deny that the Charger was to be fitted with a high performance V8. Although, in subsequent years it was revealed that Chrysler Australia did experiment with a 340ci-powered VG Valiant coupe that "went like Hell" according to the Geoghegan brothers. A 'test mule' was fitted with both the V8 and the Hemi-6 and was tested at the Mallala raceway in South Australia, with the 6cyl proving significantly faster due to less weight at the front of the car).