Hello, I’m afraid with my Cadillac Seville STS BJ1999? (EZ 2000) the cylinder head gasket is over, or it suffers from the problem with the (on)dissolving threads. It has already run hot for me in the summer with slight stress, could often only be held with air conditioning and heating on full pulley in the normal range. Since it runs on change marks and I also have other more or less running cars, he stopped at the battery maintenance charger for the first time. But then I want to do the repair. I already convinced my master mechanic to expand the engine with my support so that we can replace the cylinder head seal and also install thread inserts for the new cylinder head screws. At spare parts I have from Fel-Pro a cylinder head seal kit, in addition the new cylinder head screws as well as the water pump and the water pump key as well as a belt drive kit from Dayco (main drive and water pump) at home. What else do you need to order spare parts and exchange them at the same time? Does someone have a guide on how to do the best thing? Which special tool is still needed? Who has already done this repair and has the thread repair kit about that they might be able to borrow or sell me? mfg, puxi