HDT. 1970 saw a change of strategy as Holden chose to race the smaller Torana GTR XU-1 rather than the Monaro. The XU-1 was a special "Bathurst" version of the six-cylinder LC Torana. As the embryonic HQ Holden required too much development to be competitive Holden created an alternative to the V8 muscle car. The XU-1 was more agile, cheaper and more economical. Triple carburettors on the "Red" motor provided an excellent power-to-weight ratio. The XU-1 was easier on brakes and tyres, thereby minimizing the number of required pit stops. However, Ford refined the GT-HO to Phase Two specification with an even more powerful and better breathing 351 V8. With tyres that were able to endure the power and torque, the GT-HO reinforced the adage that "there is no substitute for cubic inches". Allan Moffat's GTHO received the chequered flag followed by Bruce McPhee's identical car. The Torana could not compensate for the power advantage that the Falcons had on the Bathurst straights. Rule changes for 1970 enabled a single driver to complete the entire race distance. To reduce the chances of another first lap calamity the starting grid was changed from 2-3-2 to a staggered 2-2-2 formation. This meant that the back markers had to start the race from around the corner on Conrod Straight. The race continued to be run to unique regulations which were more restrictive than those which were applied to Series Production racing. 1971 was another Ford victory with Moffat at the wheel. It was won by the ultimate GT-HO, the XY-model Falcon GT-HO Phase Three. This featured upgrades to engine power and aerodynamics, which made it one of the world's fastest four-door mass-produced production cars. Chrysler replaced its Pacers with its new two-door, the Charger. This was powered by a in-line HEMI six-cylinder engine with triple Weber carburettors. However, by noon on race day, Moffat was far enough in front to pit without losing the lead. Moffat completed the 500 miles first followed by other GTHOs in second and third place and filling six of the top seven places. Class wins were achieved by Mazda 1300, Datsun 1600, Mazda RX-2, Torana XU1 and Falcon GTHO. 1972 saw controversy, following a media-driven "Supercar Scare", which had accumulated enough political momentum to force Holden to postpone introduction of a V8 Torana for two years. Ford abandoned the XA model based Phase Four GT-HO Falcon. Chrysler also