Update:-
I went and had a chat with my friendly dealer - who has been very helpful even though the car is now nearly 30 years old - and they put me onto some chap who "has been doing it for years". I'm getting him to replace all of the valve guides. Then he's going to re-grind the valve seats and re-grind the valves so I get a really good fit. The head is being skimmed too - and he's going to check and replace the pre-chambers as well.
He says that I should adjust the valves on the larger side as they tend to go tight with use - has anyone ever heard about this before? Have I missed this? I've not seen any reports here before...
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