Jasper, why do you ask ? its not part of the engine rebuild if you check out the rebuild list, I had all mine changed to silicon while having engine rebuilt as I saved money on labour as engine was out anyway
When I had mine rebuilt I had all of the oil hoses replaced, I had the oil cooler flushed and I changed all of the water hoses, not that the water hoses were necessary but while the engine was out it seemed sensible to do so.