That's weird. In NSW it's the capacity of the engine, irrespective of the fuel. So if the 1992 RRc had a 3.9 Rover V8 I can fit a 3.9 Isuzu 4BD1 without question, similarly because the Stage 1 had a 3.9 4BD1 I can fit any naturally aspirated V8 up to 4.4litres and still comply with the less than 15% increase in capacity.
Go figure?



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