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What's the correct method for calculating the disc size for these two exhaust valves with no clearance at all?
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I think you have to have some clearance to know where you are. Otherwise it could be way off, and you wouldn't know the difference.
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Have you tried measuring the exhaust with the thinnest disc you have on them?
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Do this - and if you still can't get any clearance order thinner discs.
As an alternative, maybe the end of the valve stem can be ground? Though I realise this would be very hard to do with the head on the engine. Just a thought.
-Spenser