Originally Posted by
Graham you have lost me, the measurements you have are the actual clearance with lash set? no need to add on the lash again.
you valve pistons clearances are a bit small, but will probably be slightly greater with the correct valve springs installed and light spring wont pull the valve head as tightly into the head. if you dont rev the engine hard you may be ok.
as for fixing it, well aside the obvious step of machining the pistons, you could recut the valve seats and face the valves which will drop them back into the head a bit, or perhaps depending on what the valves machine a bit off the valves faces if you can find another 0.25mm you should be ok
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