Rebuilding 4AGE

[Ivan141]

I can think of a few things:

All bearings, all gaskets, all oil seals.

Piston rings, maybe new pistons.
Cilinders must me honed or bored out for oversize pistons.
Cilinder head and block must be milled flat.
Valves need to be cut, as do the valve seats.
New valve guides.

Good chemical cleaning job is also very good. Cleans out the oil and coolant passages. After that have it painted in a good engine paint, or do
it yourself.

All of these things must be done very exactly and the correct clearances must be checked when installing everything (especially bearings).