So; dis-assemble the heads, a good clean, new guides in and sizing to the valve stems, then lap the valves and re-assembly. A time consuming job but well worth the effort.
Pressing the guides in. This also holds the lower part of the valve spring cover in place. (The shaft is just to check alignment at this stage).
Here you can see that both the valve guides and valve spring covers are now intalled.
Here the valves are in, the rocker arms and shafts are intalled and the rocker arm housing.
Here you can see the inlet and exhaust cover plates installed. There are gaskets and sealer to keep things sealed. The next job is to wait until the sealer dries and then we peel off the excess.
Then its the second head and then installation on the bike.