Murray, Thanks for the update. I'm in the process of purchasing a Nordwest barrel, piston and rings from Bob Wright together with a 2nd hand Nordwest head. I'm told the Saturno crankcase has to be opened up to fit the Nordwest barrel. Then it will be uprated cams and a Davies Craig water pump and controller to replace the standard water pump. I've sourced an engineer to make a plate to seal the water jacket in place of the water pump with 47mm o d bearings to replace the pulley. Had problems sourcing 46mm o d bearings in New Zealand.
Do you have any idea of the lift and timing of the cams?
Thanks Stuart