Depends on who's doing it and how much needs fixed/replaced. If you've overheated and engine and blown the headgasket, it's quite possible the head or the block itself has also warped. They may just needed milled to be made flat, they may even need replaced. Anytime you remove a timing belt, you'd might as well replace it and the water pump as well.
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Andy - Reinstated
Hybrid Forum Moderator
'06 Subaru Legacy Spec B - Stock, for now
'98 Civic EX - CTR headlights and grill, Kosei K1's, for sale
'90 240SX - SR20DET that will never get installed, project car.