Bizzarrini figured there would also be a demand for a race version of the Grifo and developed the A3/C (C for Corsa) with a dramatic, modified alloy body. He later dubbed it his “Improved GTO", as he designed the 250 GTO when he had worked for Ferrari. In the Corsa, he moved the engine back about , making the A3/C a front, mid-engine car. To adjust the timing, mechanics had to remove a piece of the dashboard. Both the racing and road legal versions of the car were being built simultaneously. When leaving the factory, the Iso Grifo was originally fitted with Pirelli Cinturato 205VR15 tyres (CN72).