- I am thinking of doing the stem seals whilst the head is off, cambelt even tho it was done at 99k km and water pump, is there anything else that would be a good idea, and where could I get some uprated stem seals from? I'd get the head rebuilt with new stem seals and the valves reseated, it might not be required but personally that'd what I'd have done, along with having the head chemically cleaned. I wouldn't advise reusing your old belt, regardless or how recently it was replaced. Again, that's just my personal opinion. - As these are non- interference engines how does it work in rega