Hi,
Mine has done 132k it still runs smooth and pulls well. However some of the horses must have left the stable by now, I would imagine they must have got away due to vale deterioration. I want to fit a modified head in the future for two reasons, the standard head must be coming up for a referb to restore performance, so whist going to all that trouble why not fit a modified head. I am not sure if whilst at it do a overhaul of the rest of the engine. I am not sure how many miles to expect before a engine rebuild.
Regards,
Richard.