I have a 2wd sapphire cos, and I got a smoking on high over run, and once bin left tickin over, blip throttle and a cloud of smoke, so I went 4 a full rebuild, liners, in block (205) new pistons etc, and head was fully refurbed, all bk together and its the same, so brand new turbo on, And its the same. Proper run out of ideas, maybe an isue with head as its the only item whats not swapped for another. oh and its got full breather kit on.

Anyone had issues with head like this. Any help well appreciated.