If the engine is high mileage yes, replace the head bolts. If it is low mileage it is your choice, but is always a good idea to replace them.
yes you need to replace head bolts
If the head is removed you must always replace the bolts.
Yes, always install new head bolts.
All the head bolts need sealer.
No you do not.
The washers aren't required for iron heads.
Yes
Where can i order Head Bolts for a 1998 Mazda 626 2.0L? Try your local auto parts stores. If you strike out with them, try the Dealership.
You will need the intake and exhaust manifold gaskets. I would also install new head bolts.
There are no replaceable camshaft bearings. You will need to replace the head or heads.
The best way is to remove the upper and lower intake. Then loosen all the rocker arms and pull the pushrods ( need to go back in same place during reassembly). remove the head bolts pull the heads off. clean and check, the put it all back together. May have to use new head bolts.
Yes they are tourqe to yield bolts and are one time use only. Im having the problem of locating new bolts right now for my g/f's 94 zoo.