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??? Last VK 6cyl Calais we had in the family was a black 202. I thought only VL got the Nissan engine?If it’s a 6 pot Calais it’s only 3 litres (Nissan motor) and from memory maximum you can increase capacity is or was is 25 percent and that’s another 750cc total 3750 cc and a Barra motor is 4100cc.
Perhaps it’s a bent 8 and that might work.
Still not really worth doing it though is it?