I have the head off my 100 to change a broken valve spring and to decoke the head. Whilst I am here, I am considering changing the valves and guides as there is a bit of side play and some oil consumption. The service manual suggests it’s a straight forward hammer and drift to remove and replace the guide. Is it that simple? Do they jam in? Do the guides need reaming out after they have been drifted in?
I’d happily do the job myself but this does look like you could end up in a dead end here with only more hammering as a solution.