- 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 regards to getting head skimmed and thickness of head gasket if i want to keep it non interference, I take it it is best to skim the head even though the car doesn't appear to have overheated as yet? Have the surface checked, if it needs skimming then ask for minimal skimming. The engineers should be able to advise whether or not it actually needs skimming. What head gasket will be best to run 1 bar ish on TD04, I hear Athena, and where would i get one of these from? I'd go with a 1.2mm Athena and ARP headbolts for reliability.