Proton S70 R3 S1k race car unveiled – 1.6L NA CamPro engine, 300kg lighter News October 30, 2024 Arif Chan Set to race in the Sepang 1000 km endurance event, the Proton S70 R3 race car has finally been unveiled. There are also no more guesses on what engine it uses as Proton has confirmed that a 1.6-litre CamPro engine ...