Depends on the reason you are doing it and when you last inspected the shells and changed the pumps etc really.Originally Posted by cliokiz
Most of these cars that are doing the head gasket now are doing so cause they are so old and lots of other parts are on their way too, so its a good excuse for a freshen up of the rest at the same time IMHO
Mind you im probably more fussy than most like that, mine hadnt blown, was still working fine, didnt make any rattles or knocks and I pulled it apart and freshened it up just as a matter of course because I have been giving it death round track for a couple of years so felt it was due about now.