I'm going to be sorting out my worn valve guide/seals problem this June (Mitsubishi 3.0L), and I've decided to take things slow. To save time, I'm going to buy a used cylinder head, so once it's ready it's only a matter of swapping out the old one for this one. Don't think that should take more than half a day. I plan on getting the "new" head machined, and replacing the valve guides and seals on it with new OEM ones. But I was also wondering what else I should replace in the process. So far my list consists of: - Head gasket - Timing belt - Valve cover gasket You've obviously got the new coolant, etc. but is there anything else I should consider whilst the cylinder head is off the block? Thanks!